Ok,the bike is a M900ie and the tach measures 80mm across the bezel and 93mm to the outside of the bezel.It looks similar to DP part no.96502100A.The differances are the lettering (just says Ducati across the face) and its got an oil warning light inside.
The later Monster tacho's look similar again but have a little window in the bottom for a digital display.
Hope that helps.
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