Any of you guys running a monster tach, how close is the factory tach. When Im under boost at 5500k or higher i notice my tach likes to jump a little. Like a belt may be slipping but I dont feel a power loss or the car doesnt buck. It stays smooth. I was thinking the factory cant keep up with the revs.

Any thought?

 

well, if your trying to diagnose it, your going to need a scope.