Gauge cluster probs

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Electrical is my weakest subject, but I know enough to screw things up. My fuel guage, amps, tach, and maybe my temp gauges are not working. ( Yes, the only ones working are the mechanical ones ). So I took the cluster out tonight and checked the grounds, found a couple that could have been fouled but not sure. The printed curcuit looks ok and I couldnt see any obvious problems. I put the cluster back in and now have the same problem with the gauges and lost half of my lights, the lights worked prior to removal.

Question: Can any of this be bench tested? What prongs on the back go to the lights? Or should I be looking at a new printed circuit?

I would like to find a way to check the cluster on the bench so I can rule it out and check the truck or visa versa.

Thanks