I've bought 2 wireless ones for the bike & Taken them both back total rubbish, so wired is far better. When I first had Mary I had a sensor pick-up type on the Acewell dash, the pickup was on the wheel arch support & the magnet attached to the wheel, unfortunately it flew past my ear at about 60 one day. So I've not got an adapter that comes off the speedo cable out of the gearbox, much more reliable.
Alan...