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Something could be pulling on the electrical system. For instance you
could have a short somewhere. Mine was in the Electric fan, on the v8
the fan power has a plug behind the passenger headlight. Just unplug it
and drive the car around a bit and see if the gauge goes back to normal
(it will still bounce a little with the turn signal etc, standard for
these gauges) If it does your fan is on the way out like mine was. I
just pulled the fan and ordered a perma-cool for $130, and put in a 180
degree thermostat. The aftermarket fan is a little more than getting
one from the junk yard, but it has a higher cfm, and lower amp draw.
Who knows may be something else, you can have a short anywhere, plugs,
wires, ignition, etc. Electrical is a pain to troubleshoot.
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