My 2010 TNT 550F is having instrument cluster issues. It either doesn't work at all or when it is working it is very erratic. The tach gauge will work sometimes, but the speedometer needle either does not move or when it does it is way off. The lights and hand &thumb warmer all work as they should and the sled runs good. Should I be looking for a loose connection, a bad ground or is the cluster just going bad. Any help or ideas would be appreciated.