[DieInterim]

You need to pry the check light cluster from the bottom. Once that is removed you'll see several screws to remove the instrument panel. On the right side you'll see a blank immediately next to the instrument cluster. Pry this off, very slowly. Once removed you'll see several more screws. As far as the fog lamp and headlamp switches, I opted not to remove them. Instead I disconnected the wiring from the rear.
Also in order to remove the cluster, you will have to unscrew the two bolts holding the steering column in place and let it slowly down. You'll have ti remove the knee bolster to access the column bolts.

On the back of the instrument cluster there are several locking connectors. Locate the locking tang and sqeeze it to release the connector. The SI batteries are located within the instrument cluster. There are, if I remember, two black knobs that you twist to unlock the back cover. Be very careful to not pull any wires or worse as you work on this.

If you find no damage then you can unsolder the batteries and find the replacements at Radio Shack.

If the board is damaged I have found that soldering in wires to replace the dissolved traces is a doable fix. Otherwise you could always send your cluster to Programa Inc and they can repair it for you.

HTH,
Blake