Analogue Instruments
The analogue speedometer and tachometer are located in the IC. The speedometer and tachometer are each driven by an electronic stepper motor. The characteristics of this type of motor produce damping of the pointer needle. Both of the gauges return to their respective zero positions when the ignition is switched off.
The speedometer is driven by square wave signals derived from the wheel speed sensors and the Anti-lock Brake System (ABS) control module. The Powertrain Control Module (PCM) and other control modules also receive this signal on the HS CAN powertrain systems bus.
The tachometer is driven by an engine speed signal transmitted on the HS CAN powertrain systems bus from the PCM. The signal is derived from the Crankshaft Position (CKP) sensor.