The tachometer/speedometer combination for the Harley Davidson Fl Shovel models from 1981 to 1984 offers an optimal combination of functionality and aesthetics. This instrument is characterized by a speedometer disc that measures up to 120 MPH and an integrated electronic rev counter. The tachometer works by measuring the impulses from the 12-volt ignition coil. When used with single ignition systems, an additional adapter for the tachometer is necessary. This product is made under license and corresponds to high quality standards.