Common dash cluster issues question

Looks to me, having a fairly original car that has been in my family since it was new, that the bottom 3 screws holding the cluster to the dash served that purpose. And from my experience, rather poorly. But yeah, I was going to take a pigtail from the lower center phillips/hex screw on the back of the cluster and run it to ground somewhere. I haven't decided yet, but maybe the steering column mounting bolt that already has a grounding pigtail for the column.

-John