Sorry, but your friend has a mechanical combination water temp and oil
pressure guage if the car is a 75. The test you outlined will work on
an electrical guage, but not on that unit. The water temp guage has a
capillary tube which goes to a fitting just below the thermostat.
Chances are the tube is destroyed. Choices are rebuilt or new unit.
Moss is now carrying a nice repro of the guage, or your unit can be
rebuilt by someone competent. Nisonger Instrument Rebuilding for
instance. Either way it's pricy.
good luck and keep the top down. Kelvin
The J Clan wrote:
I
> have a friend that has a '75 Midget who's heat gauge is not working, we were
> told that you could disconnect the wire to the temp. sending unit and ground
> it to the engine (with the key on) if the gauge still didn't work then it's
> time for a new gauge-is this true and if so, does anyone have a gauge they
> would like to sell.
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