Hans Beck http://www.beckelektronika.nl/ makes electronic speedos and rev counters that fit in the original house; his site is in Double-Dutch but mail him at beckelektronika@planet.nl , his English is quite good!
If you decide to use that speedo, please do have it cleaned and re-lubed before. I can heartily recommend Foreign Speedo Inc in San Diego. They did mine for 100 bucks, including UV clearcoat on the face and mile wheels.
Also, Robb... did you get the e-mail I sent last week about the tools. Could really use them now