Ive had a problem with my speedo clocks for sometime now keep cutting out then coming back on with the service lights on. Today when I turned the car on only my petrol and speedo worked, my mileage I adm very faint. I tried the test on the clocks but nuffin happend and they didnt sweep. I also has a explination mark perminent on the dash. I also have 160mph speedo, is this normal for this car? Should I just change the clocks and hope for the best its only the clocks and not anything else?