amp gauge???

ironmonkey said
as i idles on its own power it keeps going up. what regulator?

Sounds like you really need to start here.

http://www.mymopar.com/index.php?pid=28

Look at Schematic A

I don't see the Duster listed in the 73 column but any of these should get you on your way. The regulator is located near the alternator in the diagrams.