‘66 Barracuda Fuel Gauge Pegged!

The lowest setting on my meter is 200 ohms. (Rats, I just bought it!)
I checked resistance from each post to can:
“S” to can reads 34.5, “I” is open.
I’d love to look inside this temp gauge but not sure how to take it apart. And if I did get inside, not sure if I’d be able to fix it anyways. I can solder a wire if that’s all it takes.