Low or no oil pressure on new engine, wtf now...

Well, it had low pressure from first crank, it never went up past 20 psi. Still working to see if its the gauge, but pulling the line while running and seeing how slow the oil was moving doesn't give me much hope on the gauge.

Just confirmed the distributor oil plug is there.

If you had an open hole where the oil line went while it was running YOU DEFINITELY HAVE A PROBLEM! I'm thinking you left a galley plug out from the very beginning since you never had oil preasure from the begining.