i think I have your answer to your revs tach as I had the same issue. When I first got my bike, as I would be riding the needle would go up and down and do crazy things...but the revs would remain normal, just the needle would do crazy things. Does this sound like your problem? If it is...and its still under warranty...take it in. They hada replace my whole gauge cluster b/c the tach was broken. Hope that helps!
Oh yea...and with one washer under the needles in florida no warm up needed. I like Alex's though if I ever had too
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