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Shouldn't be any different, and plus the '91's still had that weird cluster in it as the '88's did, as '92 would've been the first year for the tack and speedo. The only thing would probably be if you swapped the column.
It'd be worth looking into if the lens will swap between the two. Just swap your lens onto the ebay cluster if soMy 1990 GMC 1500 has the same speedo cluster as the 1992 except no tachometer. I want to find a 1992 cluster with tachometer to install in my truck. There is one on Ebay now but it is rough and has a hole in the clear plastic face.