C 2500 Truck 2WD V8-6.0L VIN U (2002)
![background image](/gmc/c_2500_truck_2wd/v8-6.0l_vin_u/Page-3286001.png)
Tachometer: Description and Operation
The IPC displays the engine speed based on the engine speed signal from the PCM. The IPC uses the engine speed signal circuit (2 pulses/engine
revolution) from the PCM in order to calculate the engine speed. The tachometer defaults to 0 rpm if a malfunction in the engine speed signal circuit
exists.