have a coulpe of questions the speedometer that is on the bike now the needle is jumping around and the guys at a bike shop here in taylors s.c. told me to take apart the speedometer and spray some white grease in it and put it back together and see if that works will that work or do I need to go ahead and get a new one and if so how do I get the miles off the old one on to the new one I have been asking old bikebarn.com if they have one that is cable hook up with a tachometer to match but can´t get a reply what do I do.