Sorry, I wasn't sure if you'd seen the earlier post. If the temperature sensor of the TMAP is not used at all, then I suppose you could tap into it without causing any other issues...Yes, of course I saw the schematic - the temps from both sensors are plugged into the ECU according to the schematic - correct? Even if the IAT is from the MAF I should still be able to use the correct lead (i.e. the "NG" colored one) from the TMAP to control the IC fans as several have done previously in this thread...
EDIT: If I'm reading the Bosch spec sheet properly, it's a thermistor and not a thermocouple. I think that actually makes it easier to deal with for making a fan controller than a thermocouple.