Speed Tach and Diesel S ignal Interface Bluetoo

The Speed Tach and Diesel Signal Interface Bluetooth (Dakota Digital SGI-100BT) is a compact gauge interface designed for mechanics and enthusiasts who need to bridge modern digital instrumentation with aftermarket speedometer and tachometer systems. This signal converter solves a critical challenge in engine swaps, custom builds, and diesel conversions—translating OEM vehicle signals into formats compatible with aftermarket Dakota Digital gauges. Whether you're retrofitting a classic hot rod with modern running gear or installing a diesel engine into a custom platform, this interface ensures accurate real-time speed and RPM data display without gauge errors or dropout issues.

The SGI-100BT uses Bluetooth connectivity to eliminate the need for hardwired signal routing, reducing installation complexity and improving reliability in engine bays where wiring clutter is unavoidable. Its dual-function design processes both gasoline and diesel engine signals, automatically conditioning factory speedometer (typically vehicle speed pulses from the transmission or ABS module) and tachometer inputs (ignition or alternator signals) into clean, isolated outputs. The compact 3.4 x 2.35 x 6.85-inch form factor allows discreet mounting behind dash panels or firewall locations, while its 0.44-pound weight makes it negligible for weight-sensitive applications. The interface handles signal voltage normalization and frequency conversion, protecting your Dakota Digital gauges from ground loops and signal noise common in custom installations.

Diesel builders and street rodders benefit most from this interface, as diesel engines often produce weak or non-standard tachometer signals that confuse standard gauge inputs. During engine swaps—LS into a classic Chevy, Cummins into a custom chassis, or turbocharged four-bangers into vintage platforms—OEM harnesses rarely match aftermarket gauge pinouts directly. The SGI-100BT eliminates trial-and-error wiring by providing standardized outputs that Dakota Digital speedometer and tachometer clusters expect. Installation requires basic electrical knowledge: supply 12V ignition power, ground, factory speed/RPM signal inputs, and Bluetooth pairing to your gauge cluster for configuration. Compatibility extends across most domestic and import vehicles with factory electronic speedometers and electronic tachometers, making it an essential tool for any serious custom automotive project.