Help using and diagnosing with a fuel pressure gauge on a 98 Camaro 3800 (V6)?

There should be a fuel line (on top of the engine) with a cap on it. Unscrew it and screw on the fuel pressure gage. If it doesn't have one, you will have to check it at the fuel filter. The gage should come with adapters to check it at any location. Turn the ignition to, "RUN" but don't start it to check.