Two Step Module Selector The Module Selectors Allow You To Choose Two Different Rpm Limits That Can Be Activated At Different Times. With This Ability, The Possibilities Are Endless MSD IgnitionThe MSD Module Selectors provide the ability to switch between two different rpm or degree modules. The different modules are activated when 12 volts are applied to the corresponding activation wire. The Selectors work with either a Soft Touch Rev Control or any MSD Timing Control that uses plug in modules. Allows a launch rev limiter and a high speed rev limiter Details: Emission Code: 5 Warranty: Manufacturer's Limited 1 Year Warranty