Not sure about GTOs but Lectric Limited markets senders as being factory correct which is where I purchased mine for my 77 T/A. On the Firebird line the resistance value for the senders and gauge are different than, for example, 78 so they’re not interchangeable between these years. I had a parts store unit that was supposed to be correct that didn’t read correctly and the lectric limited one does. FYI.
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1977 Trans Am 400/4speed (swap)
Brian
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