That’s the gauge. It also has a small dial. We have a pressure/vacuum meter to measure system accuracy.
I’m at a huge disadvantage here as the car is an hour away and I’m not doing the work on it (not that I could.). I’ve passed on everyone’s useful info.
We have pulled the carbs 4x. We have collected all the brand and model info from them (of course), talked to EMPI, installed a rebuilt kit, assured the electric fuel pump is the 1-3 psi model and not the 3-6 one, carried out the breakdown, cleaning and reassembly setup steps that all of us know all too well, changed the oil (to be careful) and still the problem persists.
We are punting and have purchased a new carb set.
Thanks to all for your advice and council.