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GN Install Harness V1.02
GN Install Harness V1.02
Connector Options

DD-EFI Installation Harness – Grand National 84-87






DD-EFI Installation Harness

84-87 Grand National

Upgrade your Grand National with ease using our Plug-and-Play Installation Harness designed specifically for your Digital Dash EFI Dash. This harness simplifies the installation process, allowing you to use the factory wiring from your Grand National

Key Features:

  • Plug-and-play design for easy installation
  • Compatible with ONLY Digital Dash EFI Dash’s
  • Specifically engineered for Grand National
  • Streamlined connections for a clean and professional installation


  • Main Connector Options (Verify before purchasing)
    • V2/V3 8-Pin Connector
    • V1 12-Pin Connector
  • Direct PNP Harness to your factory connectors
  • Designed ONLY for DD-EFI Dash’s

Installation Instructions:

  • Disconnect the battery
  • Remove the factory instrument cluster
  • Connect the Grand National Harness to factory connectors
  • Connect the other side to Digital Dash EFI Dash
  • Reconnect the battery

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