It is possible for the Speedometer and Tac gauge not to work but will not affect the way the transmission works. If the problem is in the interment cluster the transmission can still receive the input from the speed sensor. Does the check engine light come on? If the transmission isn't receiving the signal the check engine light will come on and set code. If the check engine light isn't coming on or doesn't set code for speed sensor signal you problem is more likely to be in the interment cluster. The RPM would be the same.
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