Originally Posted by markz528
Originally Posted by Cab_Burge
I know the fuel sender is a varistor (variable resistor) but I've been told that both the water temp and oil pressure senders generate current back to the meter, not resistance shruggy confused
I'll have to do some testing on the water temp senders I have in both hot and then cold water using a good VOM using Ohms and then very low DC voltage scope wrench


The fuel sender would technically be called a rheostat (variable resistor).

A varistor is a different device where the resistance varies with applied voltage. A lighting arrestor many times is a varistor. A rheostat is a variable resistor with 2 connections and a potentiometer is a variable resistor with 3 connections.


And a thermistor varies with heat. Like the ballast or the choke regulating resistor on later Mopars. Or the temperature sender.

https://www.forabodiesonly.com/mopar/threads/engine-temp-sensor-specs.184924

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