Iglobalbuy Fuel Injection Diesel Pump Pressure Gauge Tester Gasoline Test Meter Tool 145psi Comprehensive kit of adaptors and fittings for modern Schrader test port fuel injection systems. Components fitted with quick coupling system and safety valve to prevent inadvertent discharge of fuel under pressure. High pressure, dual scale gauge reading 0-145psi;Pressure release valve with drain hose for safe fuel recovery. To use it on petrol engines you will have to use either the t-piece after the fuel filter or find a cap in the fuel that one of the adapters will fit. For use with both petrol and diesel (comes with the bigger Schrader valve for diesel but not petrol)