Jumpy volt gauge

I did all of the upgrades suggested by MAD and also ran 10 gauge from the alternator to the starter relay and ran a power stud that I bought from mad to power various devises in the car; relays for the headlights and, relays for a sixteen inch fan, stereo and amp. I ran my power for the volt gauge from the fuse box and grounded it to the frame of the dash it is hooked together on a gauge set Volt, temp, oil. I ran a seperate wire from the negative side of the battery to the case of the regulator. When I checked the voltage with the meter at the alternator stud it showed the voltage going up and down from 13.8 to 14.1 and sometimes staying steady around 14.1 for a view seconds just like it shows on the gauge. It is a sun gauge set and like i said I tried changing the alternator and i have three extra regulators that i tried and they all do the same thing. I did do the upgrade to the newer stlye regulator per the wiring diagram from various mopar sites. Yes I have read alot of your postings and that is why i have been looking into all this. I'm not a wiz kid when it comes to understanding electrical stuff but I can read a simple wiring diagram don't understand them but just enough to probably get myself into trouble.