Thanks to Todd on the guzzitech forum. Found out a few answers. The oil pressure failure was probably from when I changed the oil and in memory. The vehicle speed error as it has been raining really hard lately and I have been using the bike to work. That water has entered the sensor block under the seat.The speedo has worked on and off. I was supplied a new Moto guzzi part number 06765400. The speedo sensor Griso, stelvio and bellagio from baldrick who supplied the latest version that has been sealed and hopefully will last a while longer. I have not fitted this as the speedo seems to be working now.
the displays were
Vehicle Speed Error – ECU 56
DSB 07 Oil pressure failure
Remo. Error DC Start-up Gnd – ECU 45