JEG'S makes installing a fuel pressure gauge on your 2005-06 4.6L Ford Mustang with a non-return style fuel rail, easy and simple using our CNC-machined billet adapter. It features two pressure ports for use with a gauge(s) and for fuel to supplement a nitrous system. Includes an o-ring for positive sealing, a liquid filled fuel pressure gauge in your choice of four styles, a plug for the second fitting (should you decide to add nitrous or a remote gauge later) and stainless mounting hardware. Made in USA.