Jerry,
Check and see if the oil and temp gauges are working properly. I'm guessing that there are reading low, too. If so, the silly constant voltage regulator is weak and not sending an average of 5-6 volts to the dash circuit. It is very difficult to troubleshoot this component because your volt meter will fluctuate like crazy since it's an AVERAGE of 5 volts - not constant. The regulator has a really crude method of putting out an average voltage.
If you decide to swap it out, let me know. I have the name of a guy who fabricates them out of solid state components and they put out a constant 5 volts instead of an average.
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