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Also, make sure your set up has a check valve. When I first made mine, I put the check valve at the gauge end. My compression was way low. I soon figured out to get a correct reading, your check valve needs to be just behind the GP adapter or the cubic inches of volume in the hose will give...

I am not sure a drilled out bolt would work as I think the compression would leak out the threads. The 'seal' is made at the copper gasket, mid way up the plug. I tried making an adapter out of a ORB 7/16x20 x 1/4 NPT hydraulic fitting and it sort of worked. By that I mean, the problem was the...