12.3″ Pro Dash 84-87 Buick Grand National

Build Time: Up to 6 Weeks

The DD-EFI 12.3″ Digital Dash is the first fully Plug-N-Play digital display solution for MegaSquirt-equipped vehicles. Designed specifically for 1984–1987 Buick Grand National models, this unit replaces the factory instrument cluster with a high-resolution 12.3″ LCD and custom bezel that fits perfectly into the stock dashboard opening. It delivers modern display technology while preserving OEM aesthetics.

This all-in-one enclosure includes everything needed for seamless integration with your ECU, featuring in-dash tuning, customizable layouts, and full CANBus and I/O support.

Internal I/O Module

• 7 Digital Inputs

• 5 Analog Inputs

• 1 Fuel Level Input

• 2 PWM Outputs

• Ideal for turn signals, high beam, oil pressure, fuel level, and more

CANBus Communication

• Interfaces directly with your MegaSquirt ECU

• Adds 5 sensor inputs, 7 digital inputs, 2 speed inputs, and 2 PWM outputs via CAN

Built-In GPS

• Supplies speed signal for digital speedometer

• Enables additional features: latitude/longitude, fuel economy, trip meter, odometer

Software & Features

• Full version of TunerStudio pre-installed

• Also includes MegaLogViewer and AnyDesk

• Custom splash screen

• Customizable digital dashboards

• 32GB internal storage for automatic data logging

• Sleep mode after ignition off

• Auto shutdown (default 60 min, user-configurable)

Custom Grand National Bezel

• Direct bolt-in replacement for 1984–1987 Buick Grand National factory cluster

• Matches factory dashboard for OEM+ appearance

What's Included

• DD-EFI 12.3″ Digital Dash

• High-resolution LCD screen

• Internal GPS

• 32GB internal storage

• Internal I/O Module with full sensor and output support

• Power Connector

• CANBus H/L wiring to MS ECU

• Pre-installed software: TunerStudio, MegaLogViewer, AnyDesk