If you mean the instrument display cluster "gauge" - that's the IAT off the MAF - so pre-boost temp... UNLESS you have a kit from the likes of Whipple or someone else that splits the temp off the MAF via a pigtail and then plugs into the manifold... then it's "still" IAT in the logs - but the temp it's reading is post-boost, what people call IAT2.So I assume the iat that's on the display is pre heat exchanger?
You fancy GT500 guys have both on the data bus tho...