It sounds like the gauge was designed for a non-pressurized cooling system that used plain water as the coolant. That system woild boil at 212 or less, depending how high an altitude you are at. In such a system, if you saw the gauge approach 212 you would know that you were getting close to boil-over and should take immediate actions to avoid losing your water (in a desert where it might not be easy to replace.....)
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