• Pressure gauge for jeep aluminum fuel rail

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• 0-100 PSI READING for most fuel injected applications

• 1/8 “ NPT MALE THREADED FITTING to screw into your existing fuel system

• LIQUID-FILLED to slow down engine vibration of the needle

• BLACK CASE AND BEZEL for long life and great looks

• 1 1/2 “ DIAMETER BLACK FACE for compact viewing such as under the hood

• -8 ORB to 1/8 NPT adapter

Instructions:

1. Install the 1/8 NPT to -8 ORB adapter on the front of the Aluminum Fuel Rail.

2. On the side of the adapter mark the 12 o'clock position and remove from the front of the fuel rail.

3. Hold NPT adapter in a vise using a set of soft jaws to prevent damage. Thread the fuel pressure gauge into the NPT adapter by hand until it you start to feel resistance.

4. Tighten the gauge the rest of the way using a 12mm wrench. DO NOT TWIST BY THE FACE OF THE GAUGE TO TIGHTEN!  Line up the "40psi" mark and the 12 O'clock mark made on the NPT adapter. NPT threads need to be tight to seal. you may hear squeaking from the adapter as you tighten the gauge, this is normal. If the gauge is not tight enough it will leak past the NPT threads.

5. Reinstall the Adapter and Gauge assembly in the front of the fuel rail and tighten using a -8 AN wrench