2 or 3, before or after?
During?
Once you get the cluster off the bike, remove the three nuts that hold the cluster to the metal sub-frame. You'll see each attach point in the sub-frame has a rubber donut surrounding a metal sleeve. Find a flat washer (I think 5/16"?) to fit *around* the sleeve. This washer will compress the rubber donut further, greatly eliminating the bounce that 'unadulterated' instrument clusters often exhibit when hitting the bumps.
Rick