It's driving me nuts..... I'm on my second speedo, the electronic one with the magnet, and i'm starting to think that they are not compadible with these engines running !! Always cutting out at a certain speed and sometimes going blank. I tryed a new battery and a different location, with no luck. I'm hoping sombody may be having the same problem and found a solution. Must have something to do with harmonics from the magneto Or ???????