As said before, seems like a problem with both sending units. The behavior you describe on both gauges is not normal.

First of all, I would strongly advise you to do a full service on the car (even if you have records that it had be done recently). Change engine and transmission oil (yes, transmission oil, and do use ONLY the M-B approved oil), all filters and possible do change the accessories belt and change the rear diffferential oil.

Transmission oil should be changed only at a dealer or at competent M-B mechanic with all the proper tools to do so.

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A. Rosich
CL 500, 1998
S 500 L, 1998
E 320 T, 1995 [Sadly sold ]