My customers just bought this car from Germany about a couple of months ago, haven't had time to drive it. Though today when my customers drove it for the first time, there was a terrible vibration in the steering wheel MB STAR C5, it was so bad My customers is actually am afraid to drive it now, the whole car was wobbling back in forth on the highway(this was at about 70KMH) plus the tach isn't working, the needle just is stuck at zero despite the engine being revved, what can be done?? This car is a big investment on my customers part! Plus my customers don't want to wreck it!