Instrument Cluster Gauges: Speedometer/Odometer

Speedometer is driven by a signal generated from Vehicle Speed Sensor (VSS). This AC voltage signal (proportional to vehicle speed) is sent to Powertrain Control Module (PCM). PCM then supplies a signal to a solid state unit on instrument panel which drives pointer of speedometer. Odometer is driven by a stepper motor that responds to pulses of speedometer circuit.