step one - that knob which adjusts your dash intensity pulls strait off, grab it and pull towards you
step two - if its not been touched from factory you will find a plastic nut which dosent look like a regular bolt around the outer shaft of the rheostat, use long nose pliers to unscrew it
the surrounding plastic bezel then needs to be pried out from the top first ( leaving action ) to avoid snapping the bottom clips if the plastic has gone brittle.
the little plastic bit you want to replace with a switch almost falls out, just pull right out.
when reassembling it helps to stick your hand behind the dash and hold the rheostat body while putting the bezel and doing the bolt back up ( will save you from loosing it behind the dash and going mental.
pics when your finished
![thump :thumpsup:](./images/smilies/thumbsup.gif)