Welcome to the club! That's a metric shit-ton of info & questions. Lol!! You're welcome on the Tune2Air. Been using them in my BMWs for a few years now.
I don't believe the 128 has a temp gauge. Some have swapped out to the 135 or 1M gauges.
__________________
2011 135i w/ DCT | ZSP Sport Pkg | PPK | Ohlins R
|