I don't think the dimmer funtion is aftermarket. I think it must come with the newer models. When DMNTD had his old ZX10 (old as in 2006 lol) I was leaving to go home and he started his bike and his instruments were really bright and I commented on it and said something along the lines of "that would piss me off" and he said "watch this" and dimmed them using a button or something on the instruments... must just be with the new models...
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