When diagnosing fueling issues on your truck, its imperative to have the ability to test your fuel pressure, both at idle, as well as when under load. While you could install a permanently mounted fuel pressure gauge in the truck, sometimes its handy to have a fully mechanical unit so you can easily test multiple vehicles. This kit includes a liquid filled Wika gauge, 4' diesel rated Parker hose and 1/8" MPT fitting. The tool comes unassembled so that you may add your own connection fitting without having to remove the supplied 1/8" fitting.