Posts: 2556
Joined: 5/27/2007 From: Warner Robins,GA Status: offline
I'm assuming stock gauge. I used to have a stock 91 and the gauge always read 1-2 lines above the bottom. I never had a problem with the car, i used to run the sh!t out of it at the track. If your not noticing anything it could very well be the stock gauge or sender.
Try a new sending unit first. If it stays the same, temporarily hook up a mechanical gauge to see actual pressure. Mine has about 24# @ idle hot and about 42@ 2000rpm with 10w40 @ 160K
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1988 5.0 T5 LX HB Oxford white Saddlebeige interior.
definatley, b4 u buy uneeded crap, hook up a mechanical guage where the sending unit is and verify pressure, thats where u should start, espescially with a stock guage, if it's ok, more than likely a sending unit is needed,
all things said, first thing i would do is change the oil so you know what weight is in there. i've always stood by 10w40 for most pushrod motors and it has done me fine. also, switching to another brand of oil filter may help - some brands will hamper your oil pressure. i recommend a motorcraft filter. they are really cheap and if you saw the guts you'd see they are MUCH better than the normal fram filters most people slap on their cars
The stock gauge is just a dummy light with a moving arm attached... If you're worried about it, as stated previously, check it with a mechanical gauge. Personally, if the gauge goes up at all, I don't worry.
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Low oil pressure - 
