You want a 2 wire 12v thermostat. The furnace and wiring don't know (and don't care) about temperature markings.
Here are a couple options:
Very basic:
https://www.amazon.com/dp/B003G9DD8S/
Digital (requires batteries in the thermostat but is much easier to use):
https://www.amazon.com/dp/B00H6ARNXO/
No clue about the axle. I have a different model.