Radium Fuel Pressure Gauge 0-100 psi, 1/8 NPT or 8AN ORB

Radium Engineering Fuel Pressure Gauge, 0-100 psi, 1/8 NPT or with 8AN ORB Adapter - Part #20-0029 / #20-0075

Every regulator adjustment, every pump swap, and every "why is it leaning out" starts with a fuel pressure number, and a liquid-filled mechanical gauge on the rail or regulator is still the fastest way to get one. Radium's gauge reads 0 to 100 psi with a 1/8 NPT male fitting, and it's sold alone or with an 8AN ORB adapter so it threads straight into the spare port on a Radium rail or regulator.

What It Is and Why It Works

The gauge is a 0-100 psi (0-6.9 bar) unit with plus or minus 2 percent accuracy, a stainless case, an acrylic lens, and a silicone-filled dial that damps the needle so it reads steady instead of buzzing with pump pulses. The fitting is nickel-plated 1/8 NPT male, which is the thread on nearly every gauge port and sensor port in a fuel system. The 20-0075 kit adds Radium's 8AN ORB male to 1/8 NPT female adapter, so the gauge goes directly into the 8AN ORB port on a Radium fuel rail, regulator, or surge tank with no tee in a hose. On a K-series with a Radium rail, that puts the gauge on the rail itself, reading actual rail pressure while you set the regulator.

Specs

Available Options

Fitment

Not vehicle-specific. Not for use with the fuel pressure reading in the cabin; this is an engine-bay gauge.

What to Know Before You Buy

Tape or paste on the NPT thread only, and stop a turn or two past hand tight; NPT wedges and the gauge body is the weak link. On the ORB side, oil the O-ring and don't use sealant. Point the dial where you can read it with the hood up and keep the gauge off the exhaust side of the bay; silicone-filled gauges hold up to heat, but the acrylic lens fogs if it lives next to a header. A mechanical gauge is for setting and checking pressure; if you want fuel pressure in your logs, you need a pressure sensor in the same port, and Radium's 14-0119 adapter is the sensor version of this kit's fitting.