What is a fuel guage senser

It’s called a sender, a rig that old could have wiring or gauge issues. Try grounding the wire at the sender and turn on the key, if the gauge goes all the way passed the full mark then the gauge and wiring are good. So either a wrecking yard or a parts rebuilder is your options. The engineering number should be stamped in your old sender.

Answers not posting

You should figure out if it's the gauge or the sending unit or a wiring problem .

Check Rockauto.com for a part number. If the gauge always reads Empty it's a bad ground. If the gauge always reads Full or past Full it's a bad power connection. Hope that helps! Jim