Ground hub next to battery and under dash.
Make a small ground harness for the gauges.
I bought a 7 circuit Painless kit and integrated it into the factory dash harness using factory connectors. Now some things that didn't, headlight switch iirc, have a fuse.
Ammeter bypass, I did it with a twist, used the original black feed from Alternator and connected to the starter relay. Black wire goes to under dash splice that powers everything. Dead-end the black wire there, remove red ammeter wire.
Headlight relays, H4 bulbs, LEDs, etc.