Instrument Cluster Removal, Help!

Now that you have it out, here are some of the issues:

The pins for the two harness connectors get loose/ lose connection to the traces. If you can solder, clean them and re-solder them to the board. If not, find an electronics genie who can.

Check the board where the lamp socket spring contacts meet the board. Sometimes the copper gets eroded here

Remove the boards, clean 'em, and either use new screws or "work" the screws that hold it to the cluster to make sure they make (ground) contact. Far better is to solder jumper wires to the ground traces, and with an eyelet on the loose end, ground that to the cluster along with a second pigtail which you will make from there to the column support behind the cluster

Make sure the nuts holding the gauges are clean and tight, loosen/ tighten them at the very least to make good contact

On mine, the brass springs which "make" connection to the instrument voltage regulator WERE NOT making contact with the board. Solder these to the board traces

The condenser mounted down by the speedo connection is for radio noise suppression

(Looks like you have a nut missing from one gauge already)

You don't need to use those stupid factory nuts, you can use regular machine nuts (not sure, 10-32?) and internal star washers under 'em.