Launch Control Module Selector These Limits Are Adjustable With MSDs Plug-In Modules. No Rpm Modules Are Supplied MSD IgnitionTo help drag racers achieve even more consistency, our engineers have incorporated an adjustable low rpm stage into a Three Step Module Selector! This allows you to make adjustments in 100 rpm increments from the driver's seat! The Launch Control Module features a shielded harness for increased protection against EMI so it can be mounted within easy reach of the driver. This way, as track conditions change while you're waiting in the staging lanes,