Question edited to add 'make model (what it is)', which is needed for all questions of this type.
Question moved from Cars and Trucks category to Honeywell Thermostat.
http://aw.absolutaire.com/docs/component_docs/indexed/161.pdf
It shows is as a very obscure Australian model (we are in North America). Listed as
T822 Series Mechanical Thermostats
Here is the manual
https://www.houseneeds.com/upload/pdf/honeywell-t822install.pdf
It describes it on Page 3 as;
The T822 Thermostat controls 2-wire, 15 Vac to 30 Vac, gas, oil or electric heating-only systems.
Installation and wiring are here
https://www.engineeredair.com/parts/9dt2xkJ39.pdf
A tortuous and long winded route that took 20 minutes to get there :>D
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