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If you spray methanol on the sensor, you will be measuring a form of the "wet bulb" temperature of the charge.
This is the temperature that the liquid evaporates at, and it is generally much cooler then actual air temperature of the air. The temperature measured will vary between actual air temperature and the evaporation temperature, depending on the concentration of the methanol.
A liquid on the sensor should actually make it react more quickly to temperature changes of the fluid because of the higher energy transfer that you get from liquids.
If you get a low thermal mass sensor that can react quickly, you shouldn't have any problems with putting the sensor in the UICP before the nozzles. It may require a little more through coolant temp compensation tuning though. Coolant temps will really mess with low load tuning because the intake manifold does add a lot of heat to the charge under these conditions. It bleeds off quickly with increased throttle position though.
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