Re: 67 Temp sender issues
Putting an ohmmeter across the gauge terminals and the needle pegs, is a good sign.
What might need to be done as an experiment, hook your potentiometer at the 210°F resistance between a 5 volt power supply, three 'D' cell batteries in series would work, a gauge post and the other gauge terminal back to the batteries and see what the gauge displays. If the needle goes in the opposite direction, reverse the gauge hookup.
Some gauges work on a 5 volt power supply and need a resistor to send 5 volts through the gauge to the sending unit, 12-14 volts is too much. Gauges work on current, not voltage, but lower voltage gives less current. So you might be missing a voltage dropping resistor for the gauge.
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