Right. Unless it's overcharge to begin with. It's been a while since I've seen an undersized coil. I think it took about three minute of run time with the pressures slowly raising then only a minute or two to hit the high pressure switch.
First step has already been mentioned. Pull some gas so it will run and the diagnostic reading can be captured. Then the guessing can stop and the fixing can begin.
Beware of advice given by some guy on the Internet.