I opted for a simple resistor which worked quite well.
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The booster plug claims a very wide temperature range of operation which is great when you ride in a wide range of temperatures, but I only ride between about -5C minimum and no more than 15 or 20C maximum (Scottish weather !) for most of the time, so a standard resistor is workable for me.It enrichens the fuel mixture at all points.
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Looking at how it's potted up, the potting provides a lot of thermal insulation, so even if there was a temperature sensing element in there it would have a very slow response time, maybe as long as 15 minutes
