360 oil presure

Its not an a-body, but I bought a Dodge Ram to enable me to trailor some a-bodies when needed. My question, the oil presure guage started to jump around. Like drop from 50 lbs to 10 back to 50 and so forth. Someone said the oil pump was bad. I'm hoping its just the guage but haven't had time to check. The engine is very quite no pings or knocks or anything. I have a problem with gout and today would be the day to act up. Any ideas.
thanks.