"NX has designed and manufactured the most reliable electronic nitrous activation switch available. The throttle position switch senses voltage and activates nitrous system when it reaches a preset voltage level. The new T.P.S. Autolearn, configures wide open throttle voltage with the simple push of a button. This T.P.S. switch design has built in protection to guard against short circuit damage. It comes complete with an adjustable switch module, relay, wiring harness, and all necessary hardware for a complete installation. "