I have a '99 M900 with stock instruments (speedo plus indicator lights), and I'd like to replace with a combination speedo/tach per later models. Is there anything on the market that would fit? Ducati perfered, but after-market acceptable.
I don't think you'll find OEM parts new. You'd do best to look used on ebay if you have your heart set on Ducati parts.
There are a bunch of aftermarket options for combination gauges.
http://ducatimonsterforum.org/index.php?topic=30838.0 (http://ducatimonsterforum.org/index.php?topic=30838.0)
The above+ search posts by Chromo2001. He and Industrailgrrl redid the gauges on her 620 come 900 monster for gauge info