THESE ARE "Wired" speedometers. "Wireless" get disrupted by the magnetic field generated by a motorized bike - so I only recommend "Wired"
This is the one I use most of the time - as it has shown itself to be extremely durable.
OLD SCHOOL Speedometer. Cable slightly short for stock Stingrays extra long forks but can be engineered to work if hung from lower side of handlebar, although i do not recommend it per say.