[beatnavy]

Ja, the red wire is going to the AAR. As Dave said, it's not critical at this point based on where you are in tuning/troubleshooting. It's used to help assist warm-up and the upshot is your idle may be higher for a little longer during warm-up process. The part you circled in red is the Air Intake Temperature Sensor (T1 sensor, I believe). It adjusts fuel mixture for ambient air temperature. As Anders says on his D-Jet website, it has a minor impact on fuel mixture. It's not nearly as critical as CHT and MPS, but it's another one of those things that you should address eventually.

Nice video!