Quote:
Originally Posted by RicksGTO
after following this post, I dug out the sender from my car that I believe is an original GM sender. It just has " - AC - Made in USA - 12 Volt " stamped in the neck above the threads, upside down. The gold cad/plating was pretty tarnished on it so I polished it with some course and then fine steel wool followed with some Mother's mag wheel polish and it looks almost as good as new. If it reads accurately, I'll be reusing it to see how accurate it is, will have to buy my wife the "cooking" thermometer as well to test it! Thanks for taking the time to post the sender test results Steve.
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Rick- that is the one you want, it will make cars with "guage package" temp. guage read correctly. The sender was used on GTO's as well as FB's from 70 and 71 I know, pretty sure 68-72 on all Pontiacs.. But without a doubt ...that is the good one.. And I could be wrong, but I think they were always just polished brass, with no gold plating.. could be wrong on that one.. Hold on to that unit, they are getting harder and harder to find in decent shape. And for whatever reason, the repo companies cannot make a correctly calibrated replacement... Also, I am still confused why 72 model years went to the head placement of the sender?? I pulled a dummy sender unit from the head of a 7/71 built formula 350 , but I always thought guage cars had that sender placed on drivers side of water neck in the intake manifold.I know 1970 and 1971 FB's did, RAIV,HO's and RAlll's.. only time I have seen a sending unit in the head on a Pontiac of this vintage was without guage package(i.e. idiot lights).. these senders rarely go bad...