Larry, I am not very good at acronyms so guessing that a DVM might stand for a digital voltage meter. What does the dash gauge voltmeter read when the car is at idle? What does the dash meter read when the engine is not running, but the ignition switch is turned on? Are these readings high too, or are they reading normal? When running I'd like to see 14+ volts. When not running I'd like to see 12+ volts. If the dash gauge is then reading normal, try a different DVM meter, or even better try a AVM (analog voltage meter) and see what that reads. I would bet that the meter you are now using is out of calibration. Let us know what your dash gauge reads.
'58HT and '48 Dodge Panel in MN
Thunderbird Registry #3810 VTCI#7652