Hello GMTC. New guy here (Tracy) I have a 89 silverado the past couple of months my oil gauge has been giving me problems now when the truck get up to temp the oil pressure gauge drops to zero, starts idling rough and smokes a little. I have checked all the appropriate sensors. I have even put in a lower temp thermostat, but change. I did come across a thread on this site from two years ago with the exact same problem, but it ended with no resolution. I heard this could be a over heating problem. Its never overheated on me. The truck belonged to my Grandfather and it was well taken care of. He never drove far enough to get it up to temp. lol I don't want to be a parts changer, for one thing I cant afford it. Any info on you can give would be great I'm pretty much at a dead end now. Thanks, Tracy