I have a 91 GMC Jimmy with 180,000 miles. The digital display has recently been flickering and suddenly went out the other day. The only think left to see is the odometer and speedometer. Anybody have any ideas what it might be? I already checked fuses.

Welcome to the club of Gm's junky dashes. You are lucky it lasted this long. The digital display dashes in older GM vehicles are not very reliable and it has finally probably just quit. you could connections and grounds but it is probably just the dash itself is toast. This is probably not what you wanted to hear but my grandfathers 91 Oldsmobile's digital dash just quit and only read sometimes and it needed a new dash.

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69 CST, 402 steel crank, heavy rods polished ported heads 2.19/1.88 should be 450+ 700R4 373 Posi buckets/console tilt tach 4wheel discs
Daily Driver: 92 Chev 4x4 350 auto