Most of the temp sensors (metal) I have found go up to ~250f which I'm guessing would be high enough but I worry a little about the wire that goes to the sensor...if I can get it out of the way or wrap it it something to protect it from the higher temperatures.I would attach it to the cylinder head. You could also just go off of timing, for example 30 sec preheat, if it fails to start go for a longer preheat.
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