Happened today and many times before. Only happens when I turn TCS off. My car drives nromal then all of the sudden, my RPM gauge does not work and the Slip light comes on! What is going on? This is like the 5th time it has happened. I normally just turn the car off for a few minutes and everything is back to normal? Should I take it in? They will probably say its my 19's Volks causing it, but it has happened on my stockers as well! Thoughts?