[quote/] Most modern gauges are simply glorified lights! When 12 pounds or so are reached the needle goes to the MIDDLE of the gauge. Then when the pressure drops to 12 pounds or less the needle goes to the bottom..
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If that was true and the gauge was just going to some pre-specified mid location, then I would not expect the gauge to ever move with engine speed. I don't doubt they do use gauges like that in place of idiot lights in some vehicles, but I have to believe if the gauge is moving with engine speed, then it has to actually be reading oil pressure. If I had my way, and it wasn't my daily driver that I wanted to keep clean, I would have all mechanical gauges.

Just my 2 cents.

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Sean