Yes, it can be normal.
Engine idling has the highest vacuum it will have, so PCV valve is open and sucking air from valve covers and crank case.
When you opened the oil cap the extra air caused a lean mix and engine died.
Ford has used an oil pressure switch since the early '80s, so oil pressure gauge is really an Idiot Light without a bulb, lol.
If oil pressure is above 5psi then gauge will show "normal" if below 5psi then gauge will show 0.
Now before you panic, if oil pressure was really below 5psi you would hear the valve train loud and clear, that would be the time to shut off the engine.
0 oil pressure on the Ford gauge with no engine noise means check wire on sender or replace sender.