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You aren't replacing the instruments are you???What you described happens once each time you connect the battery. The instrument needles do a sweep. Then they are supposed to stay put until you turn on the ignition, when they do that sweep again.If the needles do their stuff intermittently with the ign off, it sounds like either a bad connection at the battery, or more likely at the instruments. As guzzisteve previously recommended - a clean up of the contacts is a good idea. I use DeOxit.Gonzo
I'm glad you got it sorted Steve , the 750 Breva is a great bike.