by cjbiagi » Sun Jun 29, 2014 5:20 pm
The place I get these from make them specifically to match the original calibration for the older gauges they were designed for. The correct one should look like the second from the left with the small button on top. Many replacements are more generic in their calibration that cover a much broader series of gauges, older ones as well as later ones. This is an exact replacement in terms of calibration for the original GM part number sender. Most replacement senders cover more than one GM part number and that's why they may not be exact in their calibration.
Here's what they say about them
"Both auto part's stores and GM/Delco do sell replacement temperature sending unit, but they do not produce an accurate gauge reading in vintage cars. This is because sending units from an auto part's store and even GM, are only a generic replacement; often requiring a new, matching gauge or re-calibration of your original gauge. Months of research were devoted to this project in order to provide our customers with sending units that have the original-type terminal connection, housing and resistance (thermistor); resulting in an accurate gauge reading. They screw right into the 1/2" (not 3/8") pipe thread hole (as original)."
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Clyde.........75 Monza 2+2