I had this unit out when I fitted my Honda foglights. You have to remove the side panels then remove the bolts just inboard of the indicator stalks. There are then tabs at the lower sides of the panel. These need to be released then push in on the top edge of the panel to release the tabs there. There are 2 bosses that fit into grommets on the back of the panel. Once you get it loose, just disconnect the wiring connectors and the rest should be self explanatory. Look at the spare parts diagrams and you will see how the dash comes apart to get at the Perspex window in the binnacle.
Hope this helps.