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212F is the boiling point of water at sea level, but with a 50/50 coolant mix in a pressurized engine cooling system, the boiling point is much higher, even at high altitude.
The only 3 gauges my 95 Metro has are speedo, fuel, and temp, so I would doubt that any car made since then would have at least a relative temp gauge.
He did say one of his readings was coolant temp, so I think he should be fine to experiment with a block, if he monitors that temp.
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