UPDATE:
Had someone clamp down on the return line while I primed the pump......fuel pressure gauge read about 70 psi or so for about 2 seconds.
This tells me:
1) The fuel pressure gauge DOES work
2) The fuel pump is capable of still producing a fuel pressure of 70 psi or so.
The next test to do is to prime the pump while hooking the vacuum line up to a 20 psi boost source (probably will just used a small air compressor).
This should prove whether or not the FPR is actually working correctly.
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