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I suspect the gauge/sender/ or wiring is bad. Does the gauge peg with the key on, but engine not running? An engine wont run long(maybe 10 min with no oil pressure). suspect gauge has nothing to do with a rough running.
1. Oil Pressure Gauge Not Working
You will notice this happens when your oil pressure gauge is not reading, whether the engine is turned off, idle or running. Try to step on the gas to rev up the engine. If the oil pressure gauge still doesn't change its reading, your gauge is busted. It's best to replace it as soon as possible because you won't have any idea if your car is already overheating or not.
2. Oil Pressure Gauge Reading Too Low
When your engine is idle, the oil pressure gauge will have a low reading. When the engine starts running or when you're already cruising or on the freeway, your gauge's reading should have increased. If it stays on a low reading, then you now your oil pressure gauge is broken.
3. Oil Pressure Gauge Reading Too High
Another common oil pressure gauge problem is when your oil pressure gauge is reading too high when your engine is idle or when it's turned off. Rep
no its not to high ,some vehicles can have a higher pressure for what ever reason ,If you ever worked on the hot test bed on a vehicle assembly line like i have then you can have identical engines with varying pressure ,anything below 25lbs was rejected but the norm was around 40 to 60 lbs some even reached 80lbs ,so as long as it runs ok then leave well alone and do not worry about it ,check for oil feed to rockers and providing you have oil reaching the rockers then refit rocker cover and leave alone as this engine will last forever with regular oil changes
have to see if the oil pump strainer is clooged...oil ports clogged??? was the motor taken care of...valve covers loaded up with sludge??? pan comes off the rest is to be looked at...if she was run on no oil pressure I sure would be suspect of this motor being in poor condition. Does it run???? Is it knocking?smoking? banging or clunking? if not put a gauge on the oil pressure sending unit hole and see if it really has no oil pressure or perhaps it has a bad sender?