Have had this intermittent tach/speedo problem for a while now. Checking engine diagnostic codes afterward always shows same, U1097 Loss of Speedo Serial Data EFI. I have cleaned speedsensor, checked grounds and connectors for instruments but still have this intermittent problem. One clue I noticed this time was that the internal instrument lighting blinked off when tach/speedo flopped down. I can clear codes and everything may be good for two or three rides and then irregardless of time, temp, etc. I get this problem. Anyone have any suggestions on what to do next???