My thought is to use the motogadget "motoscope tiny" or something similar (and cheeper) and mount it to the console by making a steel/aluminum ring whose inside diameter wold fit the speedo and a outside diameter that could be attached via adhesisve to teh underneith the consol opening. my only question is weather there will be enough clearance underneith for the cable.
http://www.motogadget.com/en/frameset.html
