Ducati single instruments

[vargas1]

A few years ago, I posted a question about Ducati single clocks. I got no answer, but I'll try again.

Can anyone tell me the drive ratios for the speedometer and rev counter fitted to the late model Ducati singles? There are a few makes of 60 mm replacement clocks available but these may not be the right ratio for Ducati singles. For example, one replacement speedometer I saw has a ratio on the dial face of 60 mph = 2240 rpm. Or, do all these clocks have the same gearing but just the speedo drive gearbox differs?

My 1974 Ducati was originally fitted with Smiths instruments, and I have the original speedo gearbox, if that's any help to the experts out there. According to the Bevel Heaven speedo table, my speedo gearbox should have 20:10 gearing.

Has anyone fitted non-standard clocks to Ducati singles and what should I look out for?

Hope someone out there can advise!