Performance Overide Switch or also known as a valet switch.

For 1994-98 12v (will work on 1989-93 with different fittings-not supplied)

Override the power of your vehicle with the flick of a switch! By preventing boost to the injection pump, this kit has the ability to cut your engine’s horsepower by approximately 1/2. This switch was designed for situations when you don’t want the vehicle to make full power of your engine, such as towing, lending your truck out or just wanting the best fuel mileage possible. It’s great for kids driving their parents truck, valet drivers, or just anyone who doesn’t feel comfortable will all that power.