Is the furnace connected to power? If so, temporarily connect together the 2 leads that plug on the switch.
If the connection controls the fan, it's a fan cycling switch. It's purpose is to delay the fan until the heat exchanger is hot, that way the furnace doesn't blow cold air when it first calls for heat.
If the connection controls the gas valve, it's a high limit switch. Very important! This protects the furnace from overheating if the fan fails to run. Not an area to shortcut! Fire hazard!
If there is an HVAC supply house near you, and they will sell to the public, they should have it. Or go online, search for HVAC parts. You'll need the make, model and serial #s.
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