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. NPT – Black; AEM High Capacity Universal Adjustable Fuel Pressure Regulator. Inlet: 2 X -6 (9/16-18) Outlet: -6 (9/16″-18), Gauge Port: 1/8″NPT, Vacuum Hose: 5mm (3/16″), and Universal Mounting Bracket with Four (4) 10-32×1/2″ Screws. A longer spring provides for a wider range of adjustment (from 40 to 130 PSI). An easy-to-adjust set screw stands up to repeated adjustments. A single large return orifice is designed to handle high rate flow pumps. The regulator has a 1:1 rising pressure rate for boosted applications, and it is alcohol fuel and race fuel compatible. Customer Service & Feedback. So we have a chance to make it right – we want your repeat business! Check out the official Holley Performance. For more great deals!!