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I've read that some cars (notably Fords) have an oil pressure gauge that's essentially a glorified idiot light. It always reads normal except when pressure is far too high or zero, and then it indicates (too late) that the pressure is out of range.
That's the reason I haven't done any grill block on my Accord until I install a "real" temperature gauge/sender. I just don't know how accurate the thing is.
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