The Nitrous Express 0-4.5 volts throttle position semsor voltage sensing full throttle activation switch is designed and manufactured as 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 throttle position sensor autolearn, configures wide open throttle voltage with the simple push of a button. This throttle position sensor 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.