it seems there is an issue with Fanaleds 2.5n and the current version (steam) of Project Cars 2. I am using the Fanatec CSL Elite PS4 in PC mode, but the RevLED's don't work (gear display works).
PC2 is configured correctly:
System > Use Shared Memory > Project CARS 2
RPM/Gear feedback in Options is disabled
Other games like PC1, AC, ACC, RaceRoom or F1 2019 all work fine, either native or with Fanaleds.
I also found other threads where people report the same issue:
http://forum.projectcarsgame.com/showth ... ng-on-pc-2
http://forum.projectcarsgame.com/showth ... n-t-get-it