The Wheel Proximity Sensor is used on vehicles that either don’t have integrated wheel speed sensors, or there is no manufacturer documentation as to the location of those signals. This DMI Sensor counts pulses by detecting the knuckles of a vehicle’s driveshaft. It is often a preferred installation option for full-sized or larger trucks where the SS-10 or OBD-II sensors are not practical. The Proximity Sensor requires the 1030 Vehicle Installation Kit (No. 70004150, sold separately) for installation.