MSD Crank Trigger to Magneto Cross-Over Switch (MSD7990)SPRINT CAR PICK UP SWITCH Use with Pro Mag Part Number: MSD7990 With the Sprint Car Crank Trigger system, the timing is first set at the magneto to ensure correct rotor phasing. Then, the pick ups are switched and the timing is checked and adjusted again at the crank trigger pickup. This switch allows you to start the car and toggle between pick ups, so the car only needs to be started once to get the timing dialled in. Also, by setting the generator