Fuel pressure adjustment question

I thought it should read the same regardless if the engine if running or not but this is the first time I've done this so I thought I'd ask here just in case I was wrong. The carb is getting fuel. I'm leaning more to the defective regulator too. I wish I had another gauge to try because it is real easy to change but I don't have one. I have another regulator to try but where I have it located it isn't real easy to change but I guess I'm gonna have to try it and see what happens. I'd rather do that than have it force the carb seats open and flood my new engine and wash down the rings.

Thanks for your input Don