Crank Trigger Wheel Kit Flying Magnet Bbc 8 In. Big Block Chevy Use With 6/7/8 Series Red MSD IgnitionThe MSD Flying Magnet Crank Trigger uses four magnets secured in the aluminum trigger wheel that pass by a stationary non magnetic pick up to trigger the ignition. This flying magnet design produces accurate trigger signals and the non magnetic pick up cannot be falsely triggered. Each Flying Magnet Crank Trigger includes a two piece mounting bracket for the non magnetic pick up that in most cases will work on either the passenger side or driver's