I believe you won't need it: as per my understanding, your bike should be equiped out of the box (as any Euro 4 versions of the TV, unlike euro 3 versions where this specific harness is needed)...It doesn't change the day light right ?
I have ordered the cable one month ago, still waiting for it.
Yes, your engine is silver, and the bike is Euro 3 specs. They started to mount the harness in standard on 2017 models (black engine).I have a 2016 TVL, The high and low beams did not stay on at the same time except if you activated the "passing switch"
I new harness I installed keeps the low beam on when you turn on the high beam. So now when traveling at night you can actually see what is in front of you. It's like night and day.