According to Painless, the way they advise the fuse block to be wired, it does away with the ammeter. At least, that is what the tech advised. And yes, I have checked with mymopar.com, and no rallye dash wiring diagram. I have located one, but it's for the Barracuda, which has a different rallye gauge setup.

Right now, I cannot locate any wire that powers the gauges. Getting sort of bleary eyed, so I am most likely missing much here.