MOPED ARMY

The only thing I can think of is a bicycle speedometer, but they are pretty fragile. A speedometer has to be designed for the vehicle it's on, unless it can be calibrated somehow, like a bike computer, or handlebar mount GPS. You can get used yellow Garmin eTrex GPS units on eBay pretty cheap, and you can get a handlebar clamp for them, the problem is that the batteries go dead really fast. Peace, Jerry.