Dead easy to sort mate:
1. Take the clocks out and remove the bulbs, then remove all 8 bolts/screws on the back
2. You should be able to open the clocks, carefully hinging them at the bottom where the PCB goes into the clocks
3. Lift the speedo needle over the stop and make a note where it stops
4. Take the needle off, easiest way is to place 2 blunt table knives either side and twist them
5. undo the 2 screws holding the dial face on, be carefull with these its easy to damage the face of em
6. take the speedo face off and turn it over, you should see the holes for the lower milage
7. Cut the holes out with a very sharp knife
8. Reassemble
