I'm by no means an expert, but engine detailing is probably my favorite part of a build. Like was mentioned before...go to Radio Shack for some 30 AWG wire wrap (comes in red and blue...for black wires I just color it with a black Sharpie marker.) and go to the craft store and check out the beading section. For plug wires, vacuum lines I use the Radio Shack wire. Strip the insulation off of it for brake lines and hose clamps. Fuel lines you can use braided beading wire or buy aftermarket stuff. For heater hoses and battery cables I use slightly heavier wire, 26 AWG works well...The best place to get wire is from junk appliances and telephones because it's free! One pointer when going whole hog on the wiring and plumbing...if in doubt smaller is better than too big. Plumbing and wiring that is too big for scale looks worse than if it's just a bit too small in my opinion.