Answers to your questions: Depends upon what your eventual configuration will be.....if you are keeping it stock and only changing to 12 v neg ground, the wiring can continue to be pretty simple. IF you are adding a different engine, air conditioning, a radio, etc, then you have a conflicting wiring diagrams....in that case, I would do a temporary wiring job that essentially matches the existing wiring. Then, when the new build arises, the temprorary wiring would get removed (or partially removed) and the new wiring layout installed. Wire is cheap. I tend to wire a car using a minimum of 16 ga for signal lines and 14 ga or heavier for power. Grounding is very important, those ground wires are essential to the circuit.

mike in tucson