Joy, Joy, Jubilation, Celebration!!!!!!
I installed the Echlin temp sending unit from NAPA and the temp gauge works perfectly.
The part# is: ECH TS6178
For those who discussed the advisability of various sealing methods - this unit came already taped from Echlin with sealing tape.
Toolmanmike, I hope this fix works for you as well - if you try it please let us know!
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