Blue white is your switched live cable. You should also have a fatter red wire thats the perm live and the brown is the negative. Thats how i have my boost gauge wired in to and it works fine.
I take it you are wiring the dimming feed to the back of the headlight switch unit, if so I would advise searching for W8 light fitting threads, there is a guide on the none forum part of the site but the pic is a little unclear. I will try and find the thread i posted a tip in about it. I think the wire is grey/blue or something.
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