lol, i hacksawed my knob off! :S
to get the clocks out you have to get the top off the dashboard, after that it's quite simple. you can't just swap different clocks over, they have different screens depending on the year, fault lights in different places, etc. i fitted 182 dials to my ph1, but ended up essentially using the back of my current ones and ripping them both to pieces to fit the front on! serious bodge. even the locating parts are different, so beneath the dash mine are currently held in by gaff ftw!