Dave - was just checking your Blog and read this in reference to your steering rack :"I didnt like the thread sticking out past the Lock Nut, so I've machined up some tapered covers and brazed them to the nut to smoothen the look."
Who do you think is going to be checking out exposed treads on your steering rack? You need help mate!
Wires - bloody thick ones (not sure what gauge but mine are about 1/2" diameter and multi strand) Needed big lugs and a special crimper for the starter end and earth - dont know if you could solder - too big? I did use heat shrink but just the regular glue lined stuff. Couple of off the shelf battery terminals. Ran from back to front in some split tube - its out of site mostly.