66 Dart gas Gauge

I assume that toolmanmike is correct, that on a 66 dart the "limiter" is replaceable. My 66 Barracuda has it built in to the fuel gauge.
Does your "temp" gauge work?
Hopefully someone more knowledgeable can correct me if I'm wrong here......but I believe the "temp" & "fuel" both get the 5.5v off the limiter, therefore if the temp works..you probably could go directly to the gauge itself.

If both do not work, certainly the limiter is suspect. I believe I have one or two

voltage limiter.jpg

This is what I think you're looking for