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I'm using an Engine Guard with 2 temp probes. One of the front of the motor next to factory coolant sender where hot coolant exits the engine and one on the cold side of the thermostat housing. I usually see a 10-15c difference between the hot side of the motor and factory sender, alarm set to 100C so that would be 110-115C for actual coolant temp. https://engineguard.com.au/