Speedometer Head: Description and Operation

Instrument Cluster:

This instrument cluster assembly includes a speedometer, an odometer and a trip meter. Speedometer indicates speed. Odometer records total road mileage. Trip meter records trip mileage. Indicator needle is electrically driven by a precision DC motor circuit. Speed information source is a speed sensor on transmission. Odometer and Trip meters consist of numbered wheels that are electrically driven by a DC stepper motor.


Circuit Operation

Speedometer
A solid state circuit controls the speedometer. As the wheels are turned, an electrical signal is sent from the vehicle speed sensor to the speedometer assembly. The speedometer registers the speed of the vehicle.