diff --git a/mainsettingsdialog.cpp b/mainsettingsdialog.cpp
index 2da44ed..7cd1230 100644
--- a/mainsettingsdialog.cpp
+++ b/mainsettingsdialog.cpp
@@ -48,6 +48,7 @@ MainSettingsDialog::MainSettingsDialog(QWidget *parent) :
     ui->cbLoadConnections->setChecked(settings.value("Main/SaveRestoreConnections", false).toBool());
 
     ui->spinFontSize->setValue(settings.value("Main/FontSize", ui->cbDisplayHex->font().pointSize()).toUInt());
+    ui->cbFontFixedWidth->setChecked(settings.value("Main/FontFixedWidth", false).toBool());
 
     bool secondsMode = settings.value("Main/TimeSeconds", false).toBool();
     bool clockMode = settings.value("Main/TimeClock", false).toBool();
@@ -132,6 +133,7 @@ MainSettingsDialog::MainSettingsDialog(QWidget *parent) :
     connect(ui->cbHexGraphInfo, SIGNAL(toggled(bool)), this, SLOT(updateSettings()));
     connect(ui->cbIgnoreDBCColors, SIGNAL(toggled(bool)), this, SLOT(updateSettings()));
     connect(ui->spinMaximumFrames, SIGNAL(valueChanged(int)), this, SLOT(updateSettings()));
+    connect(ui->cbFontFixedWidth, SIGNAL(toggled(bool)), this, SLOT(updateSettings()));
 
     installEventFilter(this);
 }
@@ -199,6 +201,7 @@ void MainSettingsDialog::updateSettings()
     settings.setValue("Main/FilterLabeling", ui->cbFilterLabeling->isChecked());
     settings.setValue("Main/IgnoreDBCColors", ui->cbIgnoreDBCColors->isChecked());
     settings.setValue("Main/MaximumFrames", ui->spinMaximumFrames->value());
+    settings.setValue("Main/FontFixedWidth", ui->cbFontFixedWidth->isChecked());
 
     settings.sync();
     emit updatedSettings();
diff --git a/mainwindow.cpp b/mainwindow.cpp
index 2351670..e84da30 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -57,12 +57,18 @@ MainWindow::MainWindow(QWidget *parent) :
     verticalHeader->setSectionResizeMode(QHeaderView::Fixed);
     QSettings settings;
     int fontSize = settings.value("Main/FontSize", 9).toUInt();
-    QFont sysFont = QFont(); //get default font
+    QFont sysFont;
+    if(settings.value("Main/FontFixedWidth", false).toBool())
+        sysFont = QFontDatabase::systemFont(QFontDatabase::FixedFont); //get default fixed width font
+    else
+        sysFont = QFont();  //get default font
     sysFont.setPointSize(fontSize);
     verticalHeader->setDefaultSectionSize(sysFont.pixelSize());
+    verticalHeader->setFont(QFont());
     ui->canFramesView->setFont(sysFont);
 
     QHeaderView *HorzHdr = ui->canFramesView->horizontalHeader();
+    HorzHdr->setFont(QFont());
     HorzHdr->setStretchLastSection(true); //causes the data column to automatically fill the tableview
     connect(HorzHdr, SIGNAL(sectionClicked(int)), this, SLOT(headerClicked(int)));
 
@@ -1161,11 +1167,26 @@ void MainWindow::showTemporalGraphWindow()
     //only create an instance of the object if we dont have one. Otherwise just display the existing one.
     if (!temporalGraphWindow)
     {
+        const QVector<CANFrame> *frames;
         if (!useFiltered)
-            temporalGraphWindow = new TemporalGraphWindow(model->getListReference());
+            frames = model->getListReference();
         else
-            temporalGraphWindow = new TemporalGraphWindow(model->getFilteredListReference());
+            frames = model->getFilteredListReference();
+
+        if(frames->count() > 2000)
+        {
+            QMessageBox::StandardButton confirmDialog;
+            confirmDialog = QMessageBox::question(this, "Danger Will Robinson", "There are a lot of frames (>2000) to plot, this may take a while or crash the app. Crash likely with more than 10k frames. Continue?",
+                                          QMessageBox::Yes|QMessageBox::No);
+            if (confirmDialog == QMessageBox::No)
+            {
+                return;
+            }
+        }
+
+        temporalGraphWindow = new TemporalGraphWindow(frames);
     }
+
     temporalGraphWindow->show();
 }
 
diff --git a/signalviewerwindow.cpp b/signalviewerwindow.cpp
index 9f926f6..c061074 100644
--- a/signalviewerwindow.cpp
+++ b/signalviewerwindow.cpp
@@ -4,6 +4,9 @@
 #include "mainwindow.h"
 #include <QDebug>
 
+#define MSG_COL     1
+#define VALUE_COL   2
+
 SignalViewerWindow::SignalViewerWindow(const QVector<CANFrame> *frames, QWidget *parent) :
     QDialog(parent),
     ui(new Ui::SignalViewerWindow)
@@ -14,21 +17,41 @@ SignalViewerWindow::SignalViewerWindow(const QVector<CANFrame> *frames, QWidget
     modelFrames = frames;
 
     QStringList headers;
-    headers << "Signal" << "Value";
+    headers << "Node" << "Signal" << "Value";
     ui->tableViewer->setHorizontalHeaderLabels(headers);
-    ui->tableViewer->setColumnWidth(0, 150);
-    ui->tableViewer->setColumnWidth(1, 300);
+    ui->tableViewer->setColumnWidth(0, 100);
+    ui->tableViewer->setColumnWidth(1, 150);
+
+    QSettings settings;
+    QFont sysFont;
+    int fontSize = settings.value("Main/FontSize", 9).toUInt();
+    if(settings.value("Main/FontFixedWidth", false).toBool())
+        sysFont = QFontDatabase::systemFont(QFontDatabase::FixedFont); //get default fixed width font
+    else
+        sysFont = QFont();  //get default font
+    sysFont.setPointSize(fontSize);
+    ui->tableViewer->setFont(sysFont);
+
     QHeaderView *HorzHdr = ui->tableViewer->horizontalHeader();
     HorzHdr->setStretchLastSection(true); //causes the data column to automatically fill the tableview
+    HorzHdr->setFont(QFont());
+
+    QHeaderView *verticalHeader = ui->tableViewer->verticalHeader();
+    verticalHeader->setFont(QFont());
 
     dbcHandler = DBCHandler::getReference();
 
+    connect(ui->cbNodes, SIGNAL(currentIndexChanged(int)), this, SLOT(loadMessages(int)));
     connect(ui->cbMessages, SIGNAL(currentIndexChanged(int)), this, SLOT(loadSignals(int)));
     connect(ui->btnAdd, SIGNAL(clicked(bool)), this, SLOT(addSignal()));
     connect(MainWindow::getReference(), SIGNAL(framesUpdated(int)), this, SLOT(updatedFrames(int)));
     connect(ui->btnRemove, SIGNAL(clicked(bool)), this, SLOT(removeSelectedSignal()));
+    connect(ui->btnSave, SIGNAL(clicked(bool)), this, SLOT(saveSignalsFile()));
+    connect(ui->btnLoad, SIGNAL(clicked(bool)), this, SLOT(loadSignalsFile()));
+    connect(ui->btnAppend, SIGNAL(clicked(bool)), this, SLOT(appendSignalsFile()));
+    connect(ui->btnClear, SIGNAL(clicked(bool)), this, SLOT(clearSignalsTable()));
 
-    loadMessages();
+    loadNodes();
 }
 
 SignalViewerWindow::~SignalViewerWindow()
@@ -75,11 +98,11 @@ void SignalViewerWindow::processFrame(CANFrame &frame)
         {
             if (sig->processAsText(frame, sigString, false)) //if true we could interpret the signal so update it in the list
             {
-                QTableWidgetItem *item = ui->tableViewer->item(i, 1);
+                QTableWidgetItem *item = ui->tableViewer->item(i, VALUE_COL);
                 if (!item)
                 {
                     item = new QTableWidgetItem(sigString);
-                    ui->tableViewer->setItem(i, 1, item);
+                    ui->tableViewer->setItem(i, VALUE_COL, item);
                 }
                 else item->setText(sigString);
             }
@@ -95,20 +118,67 @@ void SignalViewerWindow::removeSelectedSignal()
     ui->tableViewer->removeRow(selRow);
 }
 
-void SignalViewerWindow::loadMessages()
+void SetComboBoxItemEnabled(QComboBox * comboBox, int index, bool enabled)
+{
+    auto * model = qobject_cast<QStandardItemModel*>(comboBox->model());
+    assert(model);
+    if(!model) return;
+
+    auto * item = model->item(index);
+    assert(item);
+    if(!item) return;
+    item->setEnabled(enabled);
+}
+
+void SignalViewerWindow::loadNodes()
 {
     int numFiles;
-    ui->cbMessages->clear();
+    ui->cbNodes->clear();
     if (dbcHandler == nullptr) return;
     if ((numFiles = dbcHandler->getFileCount()) == 0) return;
     qDebug() << numFiles;
+    for (int f = 0; f < numFiles; f++)
+    {
+        qDebug() << dbcHandler->getFileByIdx(f)->messageHandler->getCount();
+
+        QList<QString> names;
+
+        for (int x = 0; x < dbcHandler->getFileByIdx(f)->dbc_nodes.count(); x++)
+        {
+            QString name = dbcHandler->getFileByIdx(f)->dbc_nodes[x].name;
+            if(name != "Vector__XXX")
+                names.append(name);
+        }
+
+        if(names.count() > 0)
+        {
+            names.sort();
+            ui->cbNodes->addItem("----" + dbcHandler->getFileByIdx(f)->getFilename());
+            SetComboBoxItemEnabled(ui->cbNodes, ui->cbNodes->count() -1, false);
+            for(int i=0; i<names.count(); i++)
+                ui->cbNodes->addItem(names[i]);
+        }
+    }
+}
+
+void SignalViewerWindow::loadMessages(int idx)
+{
+    int numFiles;
+    ui->cbMessages->clear();
+    if (dbcHandler == nullptr) return;
+    if ((numFiles = dbcHandler->getFileCount()) == 0) return;
+    qDebug() << numFiles;
+
+    QString nodeName = ui->cbNodes->itemText(idx);
+
     for (int f = 0; f < numFiles; f++)
     {
         qDebug() << dbcHandler->getFileByIdx(f)->messageHandler->getCount();
 
         for (int x = 0; x < dbcHandler->getFileByIdx(f)->messageHandler->getCount(); x++)
         {
-            ui->cbMessages->addItem(dbcHandler->getFileByIdx(f)->messageHandler->findMsgByIdx(x)->name);
+            if(dbcHandler->getFileByIdx(f)->messageHandler->findMsgByIdx(x)->sender->name == nodeName)
+                ui->cbMessages->addItem(dbcHandler->getFileByIdx(f)->messageHandler->findMsgByIdx(x)->name);
         }
     }
 }
@@ -137,11 +207,181 @@ void SignalViewerWindow::addSignal()
     DBC_SIGNAL *sig = msg->sigHandler->findSignalByName(ui->cbSignals->currentText());
     if (!sig) return;
 
+    addSignal(sig);
+}
+
+void SignalViewerWindow::addSignal(DBC_SIGNAL *sig)
+{
     signalList.append(sig);
 
     int rowIdx = ui->tableViewer->rowCount();
     ui->tableViewer->insertRow(rowIdx);
-    QTableWidgetItem *item = new QTableWidgetItem(msg->sender->name + " - " + sig->name);
-    ui->tableViewer->setItem(rowIdx, 0, item);
+    QTableWidgetItem *nodeitem = new QTableWidgetItem(sig->parentMessage->sender->name);
+    ui->tableViewer->setItem(rowIdx, 0, nodeitem);
+    QTableWidgetItem *msgitem = new QTableWidgetItem(sig->name);
+    ui->tableViewer->setItem(rowIdx, 1, msgitem);
+}
 
+void SignalViewerWindow::saveSignalsFile()
+{
+    saveDefinitions();
+}
+
+void SignalViewerWindow::loadSignalsFile()
+{
+    loadDefinitions(false);
+}
+
+void SignalViewerWindow::appendSignalsFile()
+{
+    loadDefinitions(true);
+}
+
+void SignalViewerWindow::clearSignalsTable()
+{
+    clearSignalsTable(true);
+}
+
+void SignalViewerWindow::clearSignalsTable(bool askForConfirmation)
+{
+    if(askForConfirmation)
+    {
+        QMessageBox::StandardButton confirmDialog;
+        confirmDialog = QMessageBox::question(this, "Danger Will Robinson", "Are you sure you want to clear all of your signals?",
+                                      QMessageBox::Yes|QMessageBox::No);
+        if (confirmDialog == QMessageBox::No)
+        {
+            return;
+        }
+    }
+
+    signalList.clear();
+    ui->tableViewer->setRowCount(0);
+}
+
+void SignalViewerWindow::saveDefinitions()
+{
+    QString filename;
+    QFileDialog dialog(this);
+    QSettings settings;
+
+    QStringList filters;
+    filters.append(QString(tr("SignalViewer definition (*.sdf)")));
+
+    dialog.setFileMode(QFileDialog::AnyFile);
+    dialog.setNameFilters(filters);
+    dialog.setViewMode(QFileDialog::Detail);
+    dialog.setAcceptMode(QFileDialog::AcceptSave);
+    dialog.setDirectory(settings.value("SignalViewer/LoadSaveDirectory", dialog.directory().path()).toString());
+
+    if (dialog.exec() == QDialog::Accepted)
+    {
+        filename = dialog.selectedFiles()[0];
+        settings.setValue("SignalViewer/LoadSaveDirectory", dialog.directory().path());
+
+        if (!filename.contains('.')) filename += ".sdf";
+
+        QFile *outFile = new QFile(filename);
+
+        if (!outFile->open(QIODevice::WriteOnly | QIODevice::Text))
+            return;
+
+        DBC_SIGNAL *sig;
+        for (int i = 0; i < signalList.count(); i++)
+        {
+            sig = signalList.at(i);
+
+            outFile->write("SV1");
+            outFile->putChar(',');
+            outFile->write(QString::number(sig->parentMessage->ID, 16).toUtf8());
+            outFile->putChar(',');
+            outFile->write(sig->parentMessage->name.toUtf8());
+            outFile->putChar(',');
+            outFile->write(sig->name.toUtf8());
+
+            outFile->write("\n");
+        }
+        outFile->close();
+    }
+}
+
+void SignalViewerWindow::loadDefinitions(bool append)
+{
+    QString filename;
+    QFileDialog dialog;
+    QSettings settings;
+
+    QStringList filters;
+    filters.append(QString(tr("SignalViewer definition (*.sdf)")));
+
+    QList<DBC_SIGNAL *> loadedSignals;
+
+    if (dbcHandler == nullptr) return;
+    if (dbcHandler->getFileCount() == 0) dbcHandler->createBlankFile();
+
+    dialog.setFileMode(QFileDialog::ExistingFile);
+    dialog.setNameFilters(filters);
+    dialog.setViewMode(QFileDialog::Detail);
+    dialog.setDirectory(settings.value("SignalViewer/LoadSaveDirectory", dialog.directory().path()).toString());
+
+    if (dialog.exec() == QDialog::Accepted)
+    {
+        filename = dialog.selectedFiles()[0];
+        settings.setValue("SignalViewer/LoadSaveDirectory", dialog.directory().path());
+
+        QFile *inFile = new QFile(filename);
+        QByteArray line;
+
+        if (!inFile->open(QIODevice::ReadOnly | QIODevice::Text))
+            return;
+
+        while (!inFile->atEnd()) {
+            line = inFile->readLine().simplified();
+            if (line.length() > 2)
+            {
+                QList<QByteArray> tokens = line.split(',');
+
+                DBC_SIGNAL *sig;
+
+                if (tokens[0] == "SV1") //signal viewer save format v1
+                {
+                    // = tokens[1].toUInt(nullptr, 16);
+
+                    int msgId = tokens[1].toUInt(nullptr, 16);
+                    QString msgName = QString(tokens[2]);
+                    QString sigName = QString(tokens[3]);
+                    DBC_MESSAGE *msg;;
+                    if (msg  = dbcHandler->findMessage(msgName))
+                    {
+                        sig = msg->sigHandler->findSignalByName(sigName);
+                        loadedSignals.append(sig);
+                    }
+                    else  if(msg = dbcHandler->findMessage(msgId))
+                    {
+                        sig = msg->sigHandler->findSignalByName(sigName);
+                        //fix anything up about the name?
+                        loadedSignals.append(sig);
+                    }
+                    else
+                    {
+                        qDebug() << "Couldn't find the message by name! " << msgName << "  " << sigName;
+                    }
+                }
+            }
+        }
+        inFile->close();
+
+        if(loadedSignals.count() > 0)
+        {
+            if(append == false)
+            {
+                clearSignalsTable(false);
+            }
+
+            for (int i=0; i<loadedSignals.count(); i++)
+            {
+                addSignal(loadedSignals[i]);
+            }
+        }
+    }
 }
diff --git a/signalviewerwindow.h b/signalviewerwindow.h
index 17b1bde..711fe2c 100644
--- a/signalviewerwindow.h
+++ b/signalviewerwindow.h
@@ -17,11 +17,20 @@ public:
     ~SignalViewerWindow();
 
 private slots:
-    void loadMessages();
+    void loadNodes();
+    void loadMessages(int idx);
     void loadSignals(int idx);
     void addSignal();
+    void addSignal(DBC_SIGNAL *sig);
     void removeSelectedSignal();
     void updatedFrames(int);
+    void saveSignalsFile();
+    void loadSignalsFile();
+    void appendSignalsFile();
+    void clearSignalsTable();
+    void clearSignalsTable(bool);
+    void saveDefinitions();
+    void loadDefinitions(bool);
 
 private:
     Ui::SignalViewerWindow *ui;
diff --git a/ui/mainsettingsdialog.ui b/ui/mainsettingsdialog.ui
index d119b08..cb61d4d 100644
--- a/ui/mainsettingsdialog.ui
+++ b/ui/mainsettingsdialog.ui
@@ -7,7 +7,7 @@
     <x>0</x>
     <y>0</y>
     <width>965</width>
-    <height>678</height>
+    <height>713</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -191,9 +191,23 @@
         <item>
          <widget class="QGroupBox" name="groupBox_7">
           <property name="title">
-           <string>Font Size</string>
+           <string>Font</string>
           </property>
           <layout class="QVBoxLayout" name="verticalLayout_8">
+           <item>
+            <widget class="QCheckBox" name="cbFontFixedWidth">
+             <property name="text">
+              <string>Use fixed-width font in tables</string>
+             </property>
+            </widget>
+           </item>
+           <item>
+            <widget class="QLabel" name="label_11">
+             <property name="text">
+              <string>Size</string>
+             </property>
+            </widget>
+           </item>
            <item>
             <widget class="QSpinBox" name="spinFontSize">
              <property name="minimum">
diff --git a/ui/signalviewerwindow.ui b/ui/signalviewerwindow.ui
index b5b5d5d..8f1c75d 100644
--- a/ui/signalviewerwindow.ui
+++ b/ui/signalviewerwindow.ui
@@ -18,8 +18,11 @@
     <layout class="QVBoxLayout" name="verticalLayout_2">
      <item>
       <widget class="QTableWidget" name="tableViewer">
+       <property name="sortingEnabled">
+        <bool>true</bool>
+       </property>
        <property name="columnCount">
-        <number>2</number>
+        <number>3</number>
        </property>
        <attribute name="horizontalHeaderDefaultSectionSize">
         <number>300</number>
@@ -32,6 +35,7 @@
        </attribute>
        <column/>
        <column/>
+       <column/>
       </widget>
      </item>
      <item>
@@ -45,6 +49,16 @@
    </item>
    <item>
     <layout class="QVBoxLayout" name="verticalLayout">
+     <item>
+      <widget class="QLabel" name="label_3">
+       <property name="text">
+        <string>Node</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QComboBox" name="cbNodes"/>
+     </item>
      <item>
       <widget class="QLabel" name="label">
        <property name="text">
@@ -85,6 +99,34 @@
        </property>
       </spacer>
      </item>
+     <item>
+      <widget class="QPushButton" name="btnSave">
+       <property name="text">
+        <string>Save View</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QPushButton" name="btnLoad">
+       <property name="text">
+        <string>Load View</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QPushButton" name="btnAppend">
+       <property name="text">
+        <string>Append to View</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QPushButton" name="btnClear">
+       <property name="text">
+        <string>Clear View</string>
+       </property>
+      </widget>
+     </item>
     </layout>
    </item>
   </layout>