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Road trip, May 17
Title says it all
You could do it from first principles:
Remove coolant sender from car and connect to ohmmeter
Find a calibrated thermometer
Place both in boiling water
Note the resistance and the temperature
Allow water to cool, noting both values along the way. You now have the cal curve for the sender
Find a number of fixed resistors at temperature points you'd like to mark on the gauge
Plug each in turn into the sender connector wire in the car's harness and the other end to ground
Each resistor will cause the gauge to deflect the appropriate amount. Mark the gauge.
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