They make thermostat switches on some cars maybe subies (?) OR fords that dont close until 170 or higher. Bit of aluminum powder in JB WELD for heat transfer stuck to the radiator and wire the switch in series. Or my favorite: Zip tied electric water heater control units. I have a 2 element one that doesn't fire the lower element until the upper is at 126 degrees but is adjustable to 180.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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