If you do need a sender, I replaced mine with an aftermarket one (needed for the 12v gauges), and have the original sitting in my spare parts box. I believe it works well, but as I never had working gauges, don't know for sure - it reads 1 to 36 ohms with no gaps as I move the arm. I have no idea what it's worth, so the cost of shipping and a couple bucks for packing it and it's yours. Some rust on the top 4" or so.

Make sure the wiring harness isn't damaged, too. I think beyond full is the reading if there's an open circuit to the gauge, so damaged/disconnected wiring, bad ground, etc.

--Randy