The Equus 3640 Innova Professional Fuel Injection Pressure Tester is a helpful tool for casual mechanics and professionals alike. It can help identify and diagnose low fuel pressure, a faulty fuel pressure regulator, leaking injectors, fuel leaks and clogged fuel filters. Components include a tester gauge, a relief valve, a bleed-off hose, a gauge hose, a Tee fitting, a Ford adapter, a hose and a hose clamp. A large, 2-1/2 dial face is easy to read for accurate data. A 0-100 PSI scale is sufficient for most applications. A low measurement indicates a fuel leak or other problem. The durable 16-gauge hose and 6' bleed-off hose give you plenty of room to position your gear how you like it and allows you to provide suitable buckets for disposal of expended fuel. Solid brass fittings provide reliable durability. Keep your vehicle running smooth with this fuel pressure gauge tester.