MSD Ignition 8736 Ignition Launch Rev limiter selector Car Racing limit rpm upMSD 8736 Launch selector shift light adjustable rev limiter for up to 5 gears adjustable rev limit in each gear programmable and comes with full instructiosn leads etc plugs straight into your MSD ignition and allows different rpm for different gears get a real bargain these retail at over 195 see pictures of instructions will ONLY work with a MSD IGNITION NO OTHERS I KNOW OF! Do not buy for a hot hatch or car or motorcycle unless it HAS MSD igniton