alternator upgrade and gauge help

Ok was out there tinkering with her today got it running. I want to fix it before pulling it. It does seem a weekness. I m not concerned about factory appearanceon this one more function. I am adding it all and will be pulling motor for rebuild and want to replace it all as i do bay restore. I will go voltmeter route and relays any gauge suggestions looking at Autometer. When you get older cars you just find all sorts or things folks have done that hinder its functions and make the maze alittle more complicated STEREO to be the most common hack. Have my friend helping me while he is great on factory equipmen and cnc machines cars are still new to him. But for the love of Mopar we push on. Im considering redisign of dash to make repairs a little easier these mopar dashes where made for magic gnome hands not bread stick fingered ogers like yours truly.
Thanks guys