Would like to know this also, as well as whether to give each seperate end it's own ring terminal (4) or merge two wires to one terminal at each end (2)?
I did this on my car with an 8g wire and a 12g fusible link. I had Crackedback supply this right after I purchased his headlight relay kit. No need to use two wires. This is working wonderfully. The car seems to start faster and run stronger with the ammeter bypass. Might be a coincidence, but it definitely is better.
The old charge wire through he ammeter is still hooked up. Obviously the ammeter gauge is not accurate now. The lighter is about the only thing that will make the needle move.
I suggested to Crackedback that he build the ammeter bypass into his headlight harness as an option.