For safety reasons, all MECHANICAL fuel pressure gauges must be mounted outside of the vehicle, unless you use a fuel pressure isolator. In low pressure applications (0-15 PSI) we offer fuel pressure gauges that include the isolator and 4 ft. of braided line between the gauge and the isolator. The isolator keeps any fuel inside the engine compartment behind the firewall and not in the passenger compartment.
Another option is to use our new full-sweep electric fuel pressure gauge. Throughout the website you will find 0-15 PSI and 0-100 PSI electric fuel pressure gauges in most of our popular lines.
(15psi isolator is not available separately)
100psi isolator is part number 5282