Can someone help? I need to drive my dart tomorrow

I agree with Mattax, something is pulling way too much current after the ammeter and you need to find it. Judging from the rusty terminals on the ammeter, I'd take that apart, clean it, spray with WD-40 and make sure the connection is nice and tight too. Since a fuse didn't blow to stop the current pull I'd say you may have something going on in the wiring harness or an aftermarket accessory that wasn't fused properly.