Restoration Performance SGI-100BT Universal Speedometer & Tachometer Interface — Bluetooth, Gas/Diesel Calibration

The SGI-100BT is a compact, all-in-one speedometer and tachometer interface that recalibrates, splits, and converts electronic speed and tach signals for gas and diesel vehicle swaps.

Small but powerful, the Dakota Digital SGI-100BT packs the capabilities of multiple adapters into a 4" x 2" x 1" module. It adjusts speedometer outputs across a wide calibration range, conditions tachometer signals for both gas and diesel engines, and provides multiple speed outputs for driving several devices at once. Bluetooth connectivity and onboard controls let you tune settings from a smartphone or directly on the unit during installation.

How does the SGI-100BT correct speedometer errors after an engine or transmission swap?

The SGI-100BT recalibrates incoming electronic speed signals so the dashboard gauge reads accurately regardless of gear ratio, tire size, or transmission differences. Calibration works across a large range, so you can fine-tune the readout to match real road speed.

• Speed calibration from 25% to 400% to cover most conversions.
• Multiple speed outputs let you drive an OEM gauge plus additional devices (GPS modules, data loggers).
• Built-in electronic pull-up supports both high- and low-voltage inputs for compatibility.

Can it handle both gas and diesel tachometer signals?

Yes — the SGI-100BT supports a wide range of tach setups for gas and diesel engines. You can select cylinder counts and signal voltage type, and the unit includes specific outputs tailored for common diesel tach sources.

• Tachometer settings adjustable from 1 to 16 cylinders for accurate rpm scaling.
• Selectable 5 V or 12 V signal types to match different coil or ECU outputs.
• Diesel-specific outputs for 4-, 6-, and 8-cylinder tachometers; reads alternator W-terminal, timing gear, or optional flywheel sensor.

What setup options are available — app or on-device controls?

Programming is flexible: use the Bluetooth-enabled mobile app for guided configuration or the unit’s onboard buttons and LED display when a phone isn’t available. Either method accesses the same calibration and signal mapping features for quick tuning at the vehicle.

• Bluetooth pairing to a smartphone app for step-by-step setup and saving custom profiles.
• Onboard programming buttons and an LED display for direct adjustments during installation.
• Ability to store calibration settings so you can swap vehicles or revert to previous configurations easily.

Are there any sensors or systems the SGI-100BT should not be used with?

The SGI-100BT is designed for electronic speed and tachometer signals but is not intended for use with ABS sensors or active anti-lock braking systems. For diesel flywheel speed sensing, an optional flywheel sensor is available separately to provide a clean rpm source.

• Not compatible with ABS sensor systems — avoid using for ABS signal conditioning.
• Optional flywheel sensor sold separately if a dedicated crank or flywheel signal is required.
• Works best with clean electronic speed/tach outputs from ECUs, alternators, or aftermarket sensors.

Who is this for: The Restoration Performance SGI-100BT fits builders, hot-rodders, and installers tackling engine or transmission swaps who need an accurate instrument readout. It’s ideal for anyone adding aftermarket gauges, converting between gas and diesel engines, or driving multiple devices from one speed source and who wants both quick setup on the car and deeper calibration via a smartphone app.