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Almost all odometers have had a drive gear fail at some point, or will have, so the gear that fails should be replaced anytime serious work on the cluster is done. Part of the job is setting the mileage as you reassemble the odometer. Various 928 vendors sell a good replacement gear for about $28, and its not a very tough job. Around $100 I think if you send it out, but not a lot of shops will replace the bad gear with aftermarket, putting in an original gear that should fail like the first one.
Speedo difference is some resistor I think and a new face, pretty sure all the speedo units are the same, maybe even between other models of Porsche, but best to check part numbers at a few vendors.
Clusters are different, half a dozen or so types.
Speedo and Odo pretty sure are a single unit.
All the sending units I think are the same, tachs are different, but more differences than just those between clusters in different model years. Not sure on just the speedo, as I said above, check the part numbers.
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