My scout speedo had to be replaced last year. They did it the day before I left for our trip to Tassie. There have been others with the same problem, but it's a different problem from what V-Twin describes. Ours moved up too fast and didn't drop - I could be doing 120 kph as I changed into 2nd.
In Tassie I had my Bryton Rider 310 gps tracker that I use for cycling and kayaking. It shows the speed (plus other cycling stuff) and records the journey. I mainly upload to Strava, but Bryton also has it's own site. The problem with uploading to Strava is that it messes with the sports performance athletes by showing motorbike speeds against their running or cycling speeds. You've got to turn off certain features like leaderboard etc. I use an app on my android phone called DigiHUD if I want a gps speedo in the car. There must be lots of them out there. I sometimes use Wayze navigator and it shows speed but not as prominent as DigiHUD.
From Woodrising (no, nobody else has heard of it either) Rides a Springfield Dark Horse