Pontiac definitely wasn't too worried about the sender ground and both photos are showing the correct location (although I would clean down to bare steel on the brace to insure that the wire is actually grounding). The big O-ring sealing the sender to the tank effectively isolates it and the ground wire is necessary for the sending unit to work.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress.
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