Almanzar Motorsports Highspeed Gear tooth speed sensor. This sensor is a bulletproof with the highest rpm reading of 18,000 rpm and great heat resistance this sensor will work for years to come. We offer a 1 year replacement with original reciept. $25 replacement cost. This sensor is used with ferrous metals. We usually use these for our crank sensor kits but will also work with wheel speed as well..