Found my dads original 1971 duster!

Perfect. Thanks! Here are some pics of the fuel gauge. I just took it off. It smells very badly burnt. If I shine a light in the small open space at the bottom, it looks like a burnt coil in there. Hard to tell for sure though. Can this be taken apart without damaging it??

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They can be taken apart. That's how you defeat the internal voltage regulator when you are installing a solid state IVR. Check out the link I sent you from RTE. They have instructions there.

Damn....Treed by @Demonx2 :)