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early chev 6 had 15 lbs pressure, ford had maybe 3 lbs. So if they put a gauge on the car people would be worried because they had no oil pressure, at idle hot you have 0
I used the gauge all the time when I used to work on cars. Later cars with full pressure oil. You could tell if the mains were going bad. If you say were going 45 miles per hour and you stepped on the gas and the oil pressure dropped sure sign of loose mains.