Aeromotive Ford Rail Mount Regulator 13103 - Adjustable billet fuel pressure regulators designed to handle the demands of the Ford 4.6L, 5.0L and 5.4L engines. Installs easily on the stock factory fuel rail. (see applications below). Adjustable from 30-70 PSI. Fuel pressure rises on a 1:1 ratio when referencing boost. 1/8” NPT gauge port. Stainless steel spring, custom-designed for precise fuel control. Installation kit includes O-rings and gaskets. P/N 13102 for 94 - 98 1/2 4.6L and 94 - 95 5.0L. P/N 13103 for 86 - 93 5.0L.