I own a 2005 Triumph Thruxton, I´ve owned it for 8 years and it has nearly 70,000kms on the clock. It has run faultlessly. Just recently the backing lights in the tacho don´t work. I have replaced the globes to no avail. Does anyone know what the fault may be. The backing lights in the speedo still work. I´ve contacted a Triumph Dealer, all they could tell me it may be an earthing problem. Any ideas as to the cause of the problem please.