What is the Engine Tach Wire?

The vehicle’s Tachometer signal tells the iKey system how fast your engine is running. The iKey uses this information to determine how long to crank the vehicles Starter as well as to determine if the vehicle is running or not. For this process to work correctly the iKey needs to have its (Yellow) Engine Tach wire (from the Accessory harness of the PBS module) connected to a good Tach source from the vehicle and to “Learn” the Tachometer signal, so it can remote start the vehicle and monitor the engine RPM’s.