My old car had 98k on the clock and then i put my custom dials in it which showed 185k, I know the bloke from teh garage who was a little confused at how i did so many miles in a year, anyway when i mot'd it last year i put the dials back in so its back to 98k because the LEDs flickerd in the other one, then fixed it and put it back in, so my MOT papers say all sorts of weird things and they never questioned it on the test.