keep ammeter? / hack job

Sorry to hear about this.....
It kinda makes you wonder what else has been done to the wiring throughout the car.
I would go through it completely if it were me.
There are a lot of great tech articles at moparactionmagazine.com that deals with the ammeter and other wiring woes as well as anything else for your mopar.
Just click on the tech archive part and start reading.
Richard Ehrenburg really knows his stuff.
Good luck, and keep us posted on what happens.
Tom.