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probably some old and weak solder joints on the speedo display circuit board, i had the same thing on my 89 hud cluster. My was only effected by temperature, or my hitting the dash. I just took my out from the cluster and basically hit all the soldering joints again with fresh solder and good hot soldering iron, get one with a pretty small tip.....
Google "cracked solder joint on circuit board" if you don't know what to looks for. A magnifying glass would help at this point. If it looks questionable, hit it anyways, fresh solder wont hert......unless you put too much and it touches the other terminals....then ur just shorting things out at that point....
Another way to tell if you have the same thing that i did is to ground that small red wire behind the combo meter. You know...the one that is held down by that small Philips screw to the circuit board film...i ground my's out and all the speedo and illumination came back alive.
give it a go...noting to loose that this point...sounds like your running out of options at this point.
good luck
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