DYNATEK REV LIMITERS are designed to protect your engine from over-revving, extending the life of your motor. These limiters are compatible with any inductive electronic ignition on four-cylinder engines and offer two-stage rev limiting for launch control and engine protection. The launch RPM is controlled by the DYNA RPM SWITCH, while the high RPM limit is adjustable via a potentiometer on the unit. Installation is straightforward, with clear instructions provided in the manual.