As the others have said, if the clocks have stopped working/the electronics are bust, then unfortunately your only option is a new set...
However, what exactly is the problem? - if you've just cracked the case/surround or the lens for example, then it is possible to split the clocks (you'll need a small torx socket) and replace those parts - however, you can't buy them seperately new (only a complete clock unit for Ducati) - but try ebay/brakers etc. - I saw a number of clocks at the BMF auto jumble earlier this year - the innards would be no use of course, but the surround/lenses were sound...
xxx
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