All the OBD2 engines from 1996 on require a vehicle speed sensor. The engines up to 1995 will also idle and perform better with one installed. This hall effect speed sensor bolts to a Vanagon transmission and the magnetic ring to a cv joint flange. It has 5 pulses per axle revolution which closely approximates the Subaru pulses per mile.
Will fit Syncro, 2WD, manual, and automatic transmissions.