| I think the speedo's are all the same. All recent Dukes seem to use the same speedo drive on the front wheel up until the 749/999 and Multistrada which use a magnetic sensor on the rear wheel.
The rev counters are apparently a bit different. My rev counter died on my ST and I asked Nelly whether the rev counters were interchangeable across the range, cos there were several 748/996 ones on eBay. I was in luck, apparently the ST uses the same rev counter as every Duke aprt from the 900 SSIE so you may be out of luck on this one. | 
Jools
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