mo_dingo said:
Scott, the following is from an old archive of mine that explains in pretty good detail of what's involved installing a fuel pressure gauge on the Schrader valve. It pertains to a BBK product, but it's gonna be the same for any gauge you install.
-Step 1
Disconnect negative battery terminal and relieve any pressure in the fuel system by carefully depressing the plunger in the fuel line Schrader valve. This valve, which is similar to a tire’s valve stem, will be located either on the fuel injector rail or on the steel hard lines directly before the fuel injector rail.
-Step 2
Once system pressure is relieved, simply unscrew the entire valve assembly from the line. This valve will no longer be needed as the pressure gauge adapter fitting will replace it.
-Step 3
Carefully thread the brass adapter fitting in until a snug fit with a wrench is achieved. The threads are self-sealing tapered, therefore, teflon tape should not be necessary. To avoid cracking the fuel line use a second wrench on the hex portion of the fuel line if applicable.
-Step 4
Simply thread in the pressure gauge and tighten snugly into the brass adapter making a note of the position of the gauge face. The tapered threads can usually be tightened slightly more to orientate the face of the gauge, however, you may never loosen the thread at all or a fuel leak is guaranteed.
-Step 5
Reconnect the battery and turn ignition key on, observe to be sure that no leaks are present and that the gauge is properly functioning. Periodic inspections should be done to ensure no fuel leaks have formed.
Good luck,
Bill
The fitting for the fuel rail is a 1/16 NPT. You have to unscrew the schreader valve from the fuel rail. Autometer sells just the fitting for $7.99. It takes the 1/16 NPT and adapts it up to a 1/8 NPT female. You can either find a 1/8 NPT gauge and screw it directly on and be done with it, or do what I did. I used the Autometer fitting and then found a 1/8 NPT male to a 1/4 NPT female fitting and used a glycerin filled gauge with that 1/4 NPT back I purchased from NAPA. I could not find an 1/8 NPT gauge that was glycerin filled without ordering it. I found that 1/4 NPT from the NAPA and it is glycerin filled.