GAC's Magnetic Speed Sensors are a rugged and economic solution for detecting engine speed. The Magnetic Speed Sensor detects when ring gear teeth, or other ferrous projections, pass the tip of the sensor. Electrical impulses are produced by the sensor’s internal coil and sent to the speed control unit. The signal from the magnetic speed sensor, teeth per second (Hz), is directly proportional to engine speed. Sturdier than plastic sensors and outperforming semiconductor-type devices at high temperatures, GAC's epoxy-encapsulated sensors are unaffected by dust and dirt. Speed sensors are available in various lengths in both U.S. and metric threads. Over 35 styles are currently available. Wire leads, military connectors, Packard connectors, automotive connectors, or stud terminals are also available.