the trick to removing & replacing the speedo needle is as it says in that guide, before you pop the needle off lift it over the stop and make a note of where it stops, then make sure you put it back on the same way!
If you just swap the clocks over they should read correctly, but if not you just have to swap the speedo gear on the gearbox end. Carefully lift it out (the gear likes to fall off the end into the box which isnt good!) and swap it over. There are 2 types for petrol engined cars, you have a white & a red one. Simply swap it over to the other colour
