K 1500 Yukon Denali AWD V8-6.0L VIN U (2002)
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.
