Factory Gauges

With a proper voltage regulator the biggest concern is the ammeter.
The ammeter and factory wiring is marginal in even a stock setting. The high current output of the alternator could easily be more than the ammeter is designed to handle if you are running all your current demands through it and you have high draw accessories. If you run parallel circuits for high draw components like fans, headlights, and stereo amplifiers that are not routed through the ammeter it should not be an issue.

Here's a link to the Mopar installation instructions with more info.
http://board.moparts.org/ubbthreads/upload2/3448211-ABEHEMI5.76.1LInstallationInstructions.pdf