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Since I began this post, I, too, bought a digital meter for the lighter socket...which indicates a very steady 13.9 volts while the car is running - sometimes dropping a tenth or two when headlights are on.
The original gauge seems to have become a bit steadier also, but still jumps around sometimes, although when this happens there is no associated dimming of lights, nor anything else indicating any true voltage fluctuation issue.
At any rate...looks like all is well.
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