The last couple of years, I've had a computer/speedometer on the stoker handlebars. Works fine, except I had to splice some wire into a wired unit to reach, and the wire runs up the top frame tube and droops, etc. And I just got through re-soldering it after it got yanked on, and time to replace, I thing. And, I was thinking somebody had said they made a double-wireless unit- anyone know what that is? Anybody have any better ideas for keeping the stoker informed as to speed and mileage?

I don't need cadence, GPS, etc., just miles and speed in a reliable, hopefully, waterproof form.

Doing a google search pulls up 6-year-old threads on this website, which is informative for knowing what people used 6 years ago, but not much help now.