Instrument Cluster Description and Operation: Tachometer
WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.
The IPC displays the engine speed on the analog tachometer 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.