F2i Fuel Pressure Regulator. [Pressure Fitting 1 (left side) :-8 AN Male]. [Pressure Fitting 2 (right side): plug]. [Return Fitting: -8 AN Male]. [Mechanical Gauge : 0-100 psi Fuel Pressure Gauge]. Hydrodynamic internal cavity suitable for passthrough regulation. Zero chatter design for maximum life expectancy and maintained accuracy. Fine Pitch adjustment screw for precise setting of fuel pressure.