Mr. Wells,

My first thought would be the switch, then the grounds. Neither are fun.

Might try unpluging the switch and cleaning connector with electric contact cleaner first. Same for the plug going to the cluster. Then maybe clean and check grounds under dash. The cheap stuff first.

Or come by here is San Jose and I'll help you tear it all apart! I have an ax and a couple large hammers! ~(;<) Still have open spaces here. Manager can be a little . . . . at times. But not bad.