I believe that the first digital cluster on a S-10 Blazer was in 1989.
I had to replace the ditigal cluster in my 91 Chevy S10 at the cost, brand-new, of $400.00. Mechanic charged $100 for labor.
you need a new instrument cluster about $350 same happened to mine.
If nothing on the dash (instrument cluster) is working, I would suspect the electrical plug in back is disconnected.
first check the fuses......maybe the cluster of gauges shorted out?....may need to replace it.
Remove the two screws at the top of the instrument cluster. This will allow you to pull out the entire bezel. Pull out the bezel, and pop the switch out from the bezel.
They are integrated into the cluster. They can be replaced if you are patient and can solder well. A variety of colors are available on EBay. www.trailvoy.com Trailblazer enthusiasts forum
It sounds like a wiring issue. There could be a loose wire on the instrument cluster, on behind the fuse block.
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Fuse panel should be located on the drivers side between the door & the instrument cluster. There is also 3 relay switches located behind the back panel of the glove box.