The Circuit Hero Liquid-Filled Fuel Pressure gauge accurately measures the engine's fuel pressure.  The fuel pressure gauge is a vital tool in making sure your engine's fuel system is functioning properly and providing consistent fuel at all times. The Circuit Hero Liquid-Filled Fuel Pressure gauge is available with a black or white face. FEATURES Mechanical Operation0 - 100 PSI Range Liquid filled 1/8" NPT thread  

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