I have done the following:
-cleaned all connections (long prongs) on the circut board
-checked all connections and on the 26 prong plugs. Wires all look good
-checked connections on the rear. they were bad so I clipped and replaced. Now they are great and new
-re-sodered as many circut board connections that I could do with out causing problems.
-driven car with out cluster screwed in and when ever the speedo would quit I could wiggle the board and it would come to life.
I am 95% sure that this is a cluster issue.. Maybe just a speedo section issue but replacing the cluster seems like the next logical step.
so now I am looking for a cluster to try / replace the one I have.... Please let me know if you have one that won't cost an arm and a leg..