The GM LS Series engines are being built for a lot of different performance and racing applications. You can see good ol' hot rodder ingenuity taking place as racers are running carburetors and even using distributors on these engines! This device plugs into the factory crank sensor of an LS-engine and converts the factory trigger signal into a 12-volt square wave signal to trigger an MSD Ignition Control such as a 6 or 7 series ignition control. For racers that are incorporating a front mount distributor to their LS engines, this means you don't need to run an external crank trigger.