>> Whether you put numbers on the gauge,blue-white-red or C-N-H,the internals are the same.As with an
>> oil pressure gauge,it may well show the same pressure at all times-it shows that the
>> pressure relief valve is working.
It's likely that gauge end is basically similar whether it is a calibrated or an on/off arrangement.
I have been trying to find a source, and haven't yet, but I did stumble on this description of how to get a proportionate reading from the MX5 oil pressure gauge.
www.miata.net/garage/opg2/
As you will read, the sender is basically designed to operate a light, so the standard gauge set up gives you no information other than good/bad.
I'm pretty sure some temperature gauges operate on non-calibrated lines too, having observed a good number over the years. I'm absolutely certain that my oil pressure gauge comes into that category, as it shows the same pressure at 800rpm and 7000rpm. I have never seen a proper gauge do that.
The usual cause of gauge problems is a bad earth.
Last edited by: Manatee on Wed 24 Apr 13 at 14:36
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