Enjoy year after year of trouble free automatic shifting by mounting this Electric Solenoid Shifter behind your existing shifter. It will improve consistency of your race car and allow you to concentrate on winning the round, instead of looking at your tachometer. Here's how it works: You pull your shifter into low gear, and the solenoid automatically ''cocks''. It stays that way until your engine reaches the RPM (which is set with the RPM Activator Switch 376-RPM-1SHIFT), at that point the power is cut and the spring action shifts into high gear. When your engine reaches that RPM again, unlike other shifters, the unit will not shift more than once. A lightweight mounting bracket aligns the electric solenoid behind any foward pattern shifter. For use with a reverse pattern shift applications, the customer must fabricate a swing away bracket. This unit requires no air bottles and is permenantly lubricated to last.