Ammeter bypass

First, do you have a factory manual? If not run over to MyMopar and download one for free. It's there because of some of us on here. There are two sections, the "chassis" and the "body."

DISCONNECT the battery ground for safety

About a jumper wire. You need to have either a fuse or fuse link in that wire if you do it that way. Crackedback on here sells a nice made up kit

But a jumper wire "aint that easy." You STILL need to make sure the big red and big black wires going in through the firewall connector are in reasonable shape, as they still act as "infeeds" for power INTO the pass. compartment.

Also, pull the ammeter wires, bolt them together, and tape off.