Check the listing for details. Magnetic Rotate Speed Sensor Pick Up Sender Ring Gear Teeth 5/8-18 UNF-2A MSP675. Condition: New, Made in United States. Listed at 15.63 USD. Please check product compatibility carefully to ensure it is the product you need so as not to waste your time and energy on return. Main Characteristics: The magnetic speed sensor is mounted in the ring gear case or flywheel bell housing of the engine. The threaded hole for the speed sensor should be perpendicular to the centerline of the crankshaft and centered over the ring gear teeth. A spot face should be present to provide a flat surface on which to anchor the locknut.With the engine stopped, screw the speed senor in until it touches a gear tooth, then back it out 3/4 of a turn and secure it with the locknut. Any ferrous gear may be used as long as the frequency and amplitude .