Hi guys

Thanks a'lot for the answers. I may was a bit unclear in my first post.
It's not all my harness i want to change, just some wires, like new wiring for the headlight, mounting some gauges and change some broken wiringen. While doing that, i will make a new cable for the fuse box, main ground and starter

I stick with:
Main ground, and power to starter: 2 awg
Power to fusebox: 8 awg
From the fusebox throughout the car 14 awg

Have a nice day