I have all of the 'normal' sensor points decoded, thanks to RP Lab who provided the Pectel calculations to get the real world numbers, compare to the Fiat calculations which gave me completely bonkers numbers (the 16000rpm in the original video, for example!).

Have the main control screen pretty much complete now:

... and here's a demo of the data logging function in action:

Still would like to get information on decoding the two status bytes that are sent from the ECU which indicate sensor errors and faults, as well as any Lambda (and current fuelling mode data) sensor readings, if at all possible. It's possible by reading live memory of the running ECU, but I've no information on how to do that, and it's taking the project in a different direction than I wanted to go (not interesting in live tuning or anything like that).

Plenty of readers of this thread, no-one has any more information to contribute?