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temperature sending units

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beebopbogo

beebopbogo

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hey all,

I just put a 1972 cylinder head into my 1979 MGB. Since both years use different temperature sending units, which should I use? One is color-coded red, the other color-coded blue. What's the difference?
 
I would say use the one from your '79 as it matches the meter installed in your car. It's probably a difference in resistance and maybe a linearity difference up the scale. They would probably both work, just they would read different. You could try both and see if there is any difference. They are just temperature sensitive resistors. "Thermistors"
If you have an ohm meter, you could measure the two to see if there is any difference in resistance.
Bob
 
I agree but, if you want the ohm meter test to be meaningful, you need to heat them in the same water bath while reading them to ensure that the reading are truly the same.
That said, the odds are that they are more likely to read the same at high temperature and be different at "normal" temperatures.

Mike
 
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