Hello, a few weeks ago all the lights on the dash wouldn't come on etc speedo cluster, clock, digital heating. so I unplugged the speedo cluster being at 74k miles and plugged it into another C3 that I have on the drive, and all of the lights worked fine..it wasn't until a few days ago i noticed that my car no longer said 74k it now says 105k.. and I've got my MOT due soon and I didn't want a false reading on the ticket. I've got quotes from mileage correction places but ideally a cheap fix would be better, so if you have any ideas it would be very much appreciated!!