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Hi Bruce and welcome!
It does sound like bad connections in the instrument panel.
It would be very helpful to verify voltage with a voltmeter, both with the engine runnign and then not running. Should be 12.2 to 12.6 with key off, a bit less with key on (but not running) and 14-ish when the engine is running. This can be measured right across the battery terminals with any voltmeter- Sears sells a nice little red digital one for $20 (less when on sale), and it's fairly good quality- I like it for home use.
Voltage less than 13 would indicate the battery is in fact discharging as you are driving. Be sure the belt is not slipping, i.e. has no excessive flex in it, and then I would say that you've got to address whatever's wrong in the cluster. The mechanic seems to be on the right track- removing the cluster and tightening all screws is a very good first step.
Good luck with it! Hope this helps.
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::: Rob Bareiss, New London CT ::: 92 244 M47 211K ::: 90 745GL M47 273K ::: 88 245DL AW70 190K ::: 84 242DL Project ::: 70 VW Bus ::: 70 VW Pickup Project ::: 71 VW Notchback :::
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