MSD Ignition 8737 RPM Controls Three Step Module SelectorRPM Module Selector RPM Controls Three Step Module Selector RPM Controls Three Step Module Selector; Allows You To Choose Two Or Three Different RPM Limits That Can Be Activated At Different Times; SPECIFICATIONS: WARNING CA Proposition 65: Yes WARNING CA Proposition 65 Message: WARNING: Cancer and Reproductive Harm www. P65Warnings. ca. gov FEATURES: Set 3 RPM limits: Burnout Launch Top End rev limiters As an example, well use a drag car with a Three