I think you're golden. As long as you read correct charging voltage at 1K RPM+ across the battery with a known accurate multimeter, I wouldn't worry about it. The OEM dash volt meter is the most inaccurate of all the gauges in the cluster. I've calibrated my own and many others, but with full load (headlamps, both fans, HI blower, etc.) I still dip below midrange, but when checking w. my standard meter it's fine. A lot of it has to do with where the dash voltmeter picks up it's sensing; it was changed throughout the years. As long as your cables are in good shape, all connections are corrosion-free, and all the grounds ((batt, fenderwell, firewall, and engine block) and good, you are good. :D