it would most likely have something to do with the scintilla do you download from worldofmods, modland, or beamngmods?
Another question, Will you add a proper Tachometer in the car as well? The current UI Which is in the place of the tachometer in the real car isn't really functional and i'd love to have some tachometer in there if possible. It would make the mod just that much better.
I didn't notice how 40 minutes had passed, try to remove all mods, restart the game and see Maybe the problem is beyond your control, but I doubt it, it's strange that the video didn't help, did you follow the instructions clearly?