[Dick Boneske]

I suggest temporarily installing a gage in whichever line that is easiest to access. It doesn’t matter in which line the gage is installed, since they’re all connected together. Since the pressure is in the range of 5-7 psi, rubber fuel hose & hose clamps will suffice to connect a gage.

If you have a section of 5/16” flared tubing, cut it to a length that will allow you to connect it to one of the carb fuel inlets with hoses.

I don’t know of an ideal permanent location for a fuel pressure regulator. Unless you add a return line to the tank, I’m not sure a fuel pressure regulator will solve the problem.