Sorry to hear this Jay.
Although I've not heard of this before - here are my thoughts.
As the rev counter is electronic - I guess it's an electrical issue - although it may be a sender unit problem (presuming there is one!)
If you follow the instructions 'Dash Removal' and 'white dials' at
http://www.club323f.com/ba/tuning/technical.php and get to the backside of the dial surround - you will see that the rear of this unit is in essence a printed circuit board.
I guess this will be the first place to look for a bridged connection of sorts.
You could also look up the wiring on here:
http://www.club323f.com/ba/tuning/wires/wiring.php where the Instrument Cluster would be my first port of call.
Hope this helps
Rich