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tubman · 09-03-2017, 07:05 PM

I just went through this. Full hot with the ignition off, full cold when the ignition is turned on, and climbing to a little more than half scale as the temperature rises. Unless a '51 truck has a different system than a car (highly unlikely given the preponderance of sending units), it should work the same. Sounds like the O/P is right in his description; probably newer resistance sending units rather than original "King Seeley" units (which can usually be repaired as I found out about a month ago).

09-03-2017, 07:05 PM	#8
tubman Senior Member Join Date: Dec 2013 Location: Minnesota, Florida Keys Posts: 10,302	Re: Temp gauge works backwards I just went through this. Full hot with the ignition off, full cold when the ignition is turned on, and climbing to a little more than half scale as the temperature rises. Unless a '51 truck has a different system than a car (highly unlikely given the preponderance of sending units), it should work the same. Sounds like the O/P is right in his description; probably newer resistance sending units rather than original "King Seeley" units (which can usually be repaired as I found out about a month ago).