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Before sending your cluster for repair, I suggest you remove your cluster and spray contact cleaner on the male and female electrical contacts, and reseat the cluster a couple of times to wipe off possible corrosion, then see if there is any improvement. Just leave the face panel off for awhile during your test period over a few days. If the intermittent problem persists, Cluster Fix is there for you. Follow the instructions in this video on the Cluster Fix website to remove your cluster. This video is for a Riviera...same same as 90-91 Reatta. https://clusterfix.net/store/buick-riviera-instrument-cluster-removal-2 While the dash faceplate is off, this is an ideal time to freshen up the mottled plastic chrome bezel as I am doing. You can cut off the little abs plastic tabs and separate the plastic chrome bezel from the faceplate, then reattach them after restoring the shiny bezel. I might do that with a soldering iron to re-melt the black plastic tabs, or use super glue or JB Weld. I'm still experimenting with chrome-y paints. I'm waiting for a paint from the UK called "Mirror" that looks to have an authentic chrome appearance. It's $50 for a tiny bottle, and shipment takes weeks. Brush it on following instructions in their video with a micron thin coat. I'm not loving chrome spray paints so far. https://www.culturehustleusa.com/products/mirror