Alternator Upgrade and Bulkhead Disconnect

You don't have to do the things suggested at webpages. Put it back just like factory if you want.
Those webpages that recommend bypassing the bulkhead connections ( where meltdown has occurred ) do not consider where the next point of meltdown will be ( under the dash ).
Adding relays ( headlight circuit and run circuit and a/c circuit where applicable ) is a much smarter way to reduce the current load on those bulkhead terminals and avoid that meltdown.
I take my clues from newer vehicles. Majority of them have 80+ amp charging systems but none have heavy gauge wiring inside the cabin where the humanbeans are. Walk a junkyard and see so many burnt, all under the hood.
To replace a old and questionable OEM amp gauge with a volts gauge or with a amp gauge that has remote stunt mounted under the hood is doable/practical too.
Some number of members will chime in here to preach the madelectrical bulkhead amp gauge bypass. Again, Believe what you wish to believe, Do what you want to do. it's your car.