ScanGauge! My experience, anyway, driving the Insight in mountains, is that the dash display lights up the "normal" 5-6 bars when the coolant temp hits around 140 F, and stays that way until at least 210 or so (as hot as I've had it, IOW). I don't think it's the temperature sensor itself, since that shows reasonable behavior, climbing gradually to the 195 F thermostat opening temp, and staying there unless the engine's working really hard in a climb. Has to be in the software that drives the dash display, turning it into an idiot gauge.
I don't know why they couldn't do a sensible display, with a digital readout of actual temp, and a red LED or two to blink on overheating...
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