Race Car Universal Adjustable Fuel Pressure Regulator with Gauge Specifications and Benefits: Injected bypass fuel pressure regulator with -6 AN inlet and -6 AN return, adjustable from 0 psi to 150 maximum fuel pump capacity, designed to maintain optimum fuel rail pressure for high performance / Turbocharged engine provides maximum performance for vehicles with long life Reliable performance oil-filled design fuel pressure gauge for maximum and consistent measurement Adjustable fuel pressure regulator with 1:1 ratio 1/8 inch NPT gauge port Made of CNC machined lightweight aluminum materials Package: 1* Fuel Pressure Regulators 1* Regulator Gauge ( With Gauge / No with ) Installation: Universal fit for all cars Professional installation is highly recommended (No instructions)