Re: temp gauge
In a pot, 2 qt or larger, of water.
Get a battery, lawn mower/motorcycle would be fine.
Thermometer you trust.
Sending unit and gauge.
You might even add a thermostat - suspend it in the water, don't let it touch the pan.
Wire up the battery to gauge to sending unit in water to battery, just as if it were in the car, minus the switch. You might have hose clamp the ground wire to the unit body. Heat the water and watch the gauge & thermometer. Water at sea level boils at 212°F, and that's a calibration fact.
Compare all items, gauge reading, thermostat start to open, then t/stat full open, usually 10° later.
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