There is more here than you might think. The gauge has a 3-position paddle switch with a mini valve built in. No need for external valve wiring. Switch up activates the Compressor, Switch down releases air. Can pay a lot more, have a lot more wiring headache and get less.The item "Tow Assist Control In Cab Air Height Control Electric Switch Kit Gauge, Compress" is in sale since Wednesday, July 4, 2018. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts\Suspension & Steering\Lower Kits & Parts". The seller is "chassis_tech" and is located in Mesa, Arizona. This item can be shipped worldwide.