8-Inch 12-1X Crank Trigger Wheel8 Inch 12 1X Crank Trigger Wheel For Gen III and IV LS Overview Upgrading to an MSD Flying Magnet Crank Trigger Kit will deliver the precise and reliable signal that a high performance engine requires. This kit gives you the ability to control timing electronically through a Holley EFI ECU (or other standalone engine management system ignition controller). At the heart of the kit is the 3 wire Hall Effect Sensor that is easier to set up, less