Hi,
I haven't seen this problem for a long time. First, it could be the rheostat on the sending unit is going bad and not making a good connection.
I remember the gauge would fluctuate when turning or accelerating, but your issue looks like it is a connection issue. Have you checked the grounds at the tank for the sender? Also, at the firewall, check to make sure the bulkhead connector is in good condition, and nothing is loose or corroded.
I tried to find wiring schematics for you, but because of the model year, there aren't any available in my manual. However, check for what I mentioned to see if anything is loose, corroded, damaged, or anything that could cause a weak connection.
I have a 78, so I can go check things for you if needed. Different year, but still very similar.
Take care,
Joe
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Monday, January 10th, 2022 AT 6:37 PM