Glad you got it figured out!!
However could you help me out if you don’t mind? Does this method work correctly when there are hair-pins in the track (ie 180 dgree turns). Does it show Wrong Way when you make the turn? I am very much interested in this topic. So I’m looking for different techniques.
Could you tell me what did not work exactly? You didn’t see any ‘Wrong Way’ messages on the top-left corner?
Anyway check these:
The Blueprint extended from Pawn must be the Player charcter (in you case this would mean you need to extend from Vehicle).
Make sure the HUD blueprint is the one beign used in GameMode
Check collsion settings and see if Begin Overlap is fired correctly.