Pulled cluster - now dash lights don't work

I'm very interested in this post. I'm going to be pulling the dash and gauges on my 67 dart soon. Do you 67dart273 think even if my gauges all work I should hook up a good ground wire? I'm still a little unclear about where to connect wire on back of circuit board. Is there a screw or stud that is on the back for the purpose of grounding? I know that you said trace the copper foil to a illuminating bulb and you are saying use a tab or stud/screw that should be at the bulb? Sorry about all the questions but trying to learn more about electrical it is foreign to me. Thanks

Carl