The cheapest alternative is to put a GPS on the bike and use it as your speedo. Another alternative is to send your speedo to these guys in San Diego, they fixed mine. http://foreignspeedoinc.com/

We all like to think of ourselves as rugged individualists. But when push comes to shove most of us are sheep who do what we are told. Worst of all, a lot of us become unpaid agents of whoever is controlling the agenda by enforcing the current dogma on the few rugged individualists who actually exist.