Quartz Electric Speedometer

The quartz electric speedometer and odometer assembly displays vehicle speed, total vehicle mileage, and trip mileage. A conventional dial and pointer assembly, along with odometer wheels, are used to display this information. However, improved drive methods are used in place of standard drive system, thereby eliminating need for conventional speedometer cable.

To provide accurate vehicle information, the quartz speedometer utilizes an accurate clock signal supplied by a quartz crystal, along with integrated electronic circuitry to process an electrical speed signal. The speed signal is used by the circuitry to drive the air core gauge and odometer stepper motor.

The electrical speed signal is generated by a Permanent Magnet (PM) generator mounted in the transmission. This speed signal is transmitted to the speedometer assembly buffering circuit contained in the instrument cluster circuitry.