HellsBells
620/677
It's the Intake Air Temperature sensor - and measures the temp of the air entering the induction system. The stock IAT is part of the MAF sensor. On a blower car, the air temp can change dramatically between the MAF and the cylinders (due to the supercharger and charge cooler) and therefore measuring the temp at the MAF isn't particularly useful for engine control. One option is to relocate the IAT sensor to the intake manifold (or an intake runner) to measure the actual temp of the charge entering the cylinders. Mine is relocated to runner 6:
Is that the parts from the AM kit you used? I don't recall a brass fitting for it. Details appreciated!