Well since winter is here I figure its time to work inside the house. So I figure I will spend the winter building a wiring harness for the whole car. Lights, radio, ignition and everything else but the engine.
The question I have is what gauge wire should I use for all this? Is there a specific size I should use for each or can I use the same size for all? This will be a 12 volt system with either a 318 or 360 in it.
So I need the size for horn, headlights, taillights, parking lights, interior lights, radio, ignition, reverse lights and anything else I might have missed. I want to keep the minimum amount of wire running through this car, Less wire going places less chances of problems.

Thanks
Joker51