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X2, I fixed the flaky response of my temperature gauge by cleaning the post of the temperature sender and the female connector plug with CRC electric contact cleaner to remove the corrosion. Then I tightened the grip of the female connector by using an old bent sewing machine needle.
In the attached picture (sorry, it is a little out of focus), you can see there are 8 small spaces on the outside of the metal portion of the female connector. I wedged the needle into one of the small holes as far as it would go and then pushed the shaft of the needle towards the center of the connector. The sewing machine needle is in the top hole at the 12 o'clock position in the photo.
After repeating this for each of the 8 holes the connector then gripped the sender firmly. With a better connection, the temperature gauge is steady and it never pegs or fails to register.
If this doesn't take care of the problem, I would then recommend checking the ground end of the circuit and/or checking for continuity in the wire.
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78 W116 300SD 'Desert Rose' new as of 01/26/2014
79 W116 300SD 'Stormcloud' RIP 04/11/2022
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