250-500cc wiring harness needed?

hey all do i need the wiring harness if im not running the oem speedo, switchblock, lights etc? gota trailtech speedo thats wired direct from stator, no tail light, headlight not important as dont ride at night but if i can i would wire it direct as well as killswitch? is this possible, does it run anything else? gota lot of excess wiring near headstock thats not being used! 2010 wr300(AUS street legal version)

If it's anything like the USA models, I wouldn't think so. I didn't use the harness on mine when I installed lights.

hows the killswitch & headlight wired up mate?

Killswitch is a basic one that are on MX bikes. I originally just installed the headlight to the yellow power wire but had issues starting the bike, so I installed a basic toggle switch to turn the light off.