In the top pic, there is another ground wire that I ran directly to the dash frame. In both pics, you can see where I added a small washer under the head of the board mount screw to mount it tight and grounding it to the cluster case. Also got rid of those speed nuts and installed real ones with stainless washers on the studs. All contacts had to be cleaned on the boards as well as the light socket contacts that touch the board. An eraser, emory board or fine sand paper all work well. Just be carefull not to scuff something you don't want to.
