[dsraven]

sometimes easier to get a headlight switch with a plug in on the back instead of the screw on style, if you ever have to remove or work on the switch it is easier to unplug than unscrew it. unless you leave enough wire back there to let it droop when undone from the dash so it falls below the level of the dash.
some heat shrink vendors sell 4 ft lengths but those are fine too. a good pair of crimpers is a must, try not to use the ones that simply press 2 sides flat. use the non insulated connectors and shrink tube, that way you can see the crimp and then the shrink tube insulates it.