Re coding instrument cluster ?
#2
Drifting
Re-coding for why?
#3
sounds like it's this letter for the TPMS programming. My 2015 GT3 had the cluster recoded to adjust the maintenance schedule.
https://rennlist.com/forums/991-gt3-...l#post15889524
https://rennlist.com/forums/991-gt3-...l#post15889524