u mean the plastic bit which holds the dials ?
remove the dash via torx screws, 3 by air vents close to windscreen, 3 under shiney metallic plastic bit in front of passenger seat, 1 right of steering wheel, 2 under cover of steering housing which pops off. remove the plastic pillar covers from dash to ceiling (remove rubber 1st and plastic torx screw at either side)
With all above the dash should push towards the screen and lift out. Be VERY careful if youve removes the rubber door seal as u can damages the surface when it screapes againds the metalwrok which was covered . also beware as its a fkin pain as sometime it can be a pig to get the clip past the passenegers airbag (youll understand when you have it off)
Once of the speedo can be twisted up and the 2 connectors removed freeing the speedo.