Temp gauge help

[dmjlambert]

I believe you would need to match the resistance of the original part in order for the gauge to read accurately from one end of the scale to the other. To test, heat some coolant on a stove and measure with a candy thermometer and dip the sensor in it and see how the gauge reads. If the coolant is very hot, such as 240, you will want the gauge to be showing a hot reading. It may be easier to get a new gauge or pull the stock resistor from a used cluster. It could be a member here has a stack of junk clusters and can offer you one. I see the LMC catalog has the gauges for $30 but don't know if they come with the resistor.