Cuda overcharging? Please help...

I have been down to old town a few times but it's a trek from out east where I live. I should get down there more often...

I'm pretty sure that the red wires and the "twist and tape" method is NOT stock... :lol: Looks like you suffer from PO syndrome ( I'm sure the Previous Owner had good intentions... or maybe not... )
As for wiring diagrams, there is a ton of info here

The blinkers will bounce the ammeter, that's nothing to worry about, but since you bypassed it no need to worry about your car burning to the ground while you sleep either.

The pushbutton start thing could be that the ign switch or connections are gone/corroded or were forgotten from the cool wire nest.

Now the fun part. Forensic electrician work!! You have to try to understand what the PO was trying to fix and cross reference it with the original diagram before you just go tearing it out or who knows what you'll end up with.