Had my speedometer re calibrated at the factory a couple of weeks ago, it was under reading and therefore illegal. Don't know if the 3W uses the same make of gauge but if it does you can't reset yourself even though the website suggests you can. My speedo now shows V3 on startup although I can't recall anything appearing before.
One tip to check whether it's the front wheel sensor or the analogue gauge is to compare the digital readout with the analogue one. If they are the same, and it's incorrect, then the pulse setting needs to be changed but if they differ it's likely that the analogue gauge needs adjusting. Either way it's back to the factory because the dealers haven't got the kit to fix it.
