Had this on Tango a couple of years ago.Cause damage to the speedometer and needed to be changed.That ended up expensive,since it happened during service at a dealer.Dash needed to be removed to dry out all electrical connections.

Rudolf

Morgan Aero8 S4 «Tango»
Fisker Ocean
Harley Davidson Livewire
BMW R100/7 , R100R
Moto Guzzi 254