Resetting Guage Cluster

Okay, I've got to assume that we're talking about a just-out-the-door wreck. Otherwise, the cluster would still be under warrantee. So, what's the problem? You've got a paid-next-to-nothing-for-it bike with an extra 3K on the odo, big deal! Unless the salvage guy is your cousin - and you got the title before it was sent to the DOT - and you're planning on turning it over as a clean-titled bike, why should you care?