Hey Guy's. Just your thoughts on something. 1980 Corvette. 59,500 miles. The last time I drove the car oil pressure gauge dead nuts on 40 lbs. at cruising speed, around 50 mph. Needle never moved. Today went to take it out for a ride and now I have fluctuation on my gauge. It is swaying back and forth between 37 and 40 lbs. Your thoughts? I just want to make sure I do not have an oil pump going. Thanks for your time. Don