Add to Favorite Sellers. 25-305BK AEM Universal Adjustable Fuel Pressure Regulator – 40-130 PSI. Inlet: 2 x -6AN (9/16-18) Outlet: -6AN – Gauge Port: 1/8 in. Universal fuel pressure regulator adapts to virtually any vehicle. Longer spring for wider range of adjustment (40 – 130 PSI). Three -6AN (9/16-18) ORB O-ring style inlet ports (2 […]