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can you contact the manfacturer? if you don't have the original box it came in with that info, I have mine and can send you the info.
also, have you checked the battery?
When adjusting zero, there is no movement until one spot when the needle jumps all the way to the right. BTW I disconnected the light when I first got it.What is your twinmax doing or not doing??? Does the meter light???
Old thread, but I'm curious what the original poster did in the end. I did TB sync last week and had precisely the same problem with my Twinmax, which had worked fine for somewhere between 2-3 yrs.
My solution was to buy some clear tube and build a manometer in about 20 min. Worked quite well and the bike is running very smoothly.