Remove the dash bezel (not sure of the specifics on a '98 Dak - don't know
if there's any screws holding it in place), then remove the screws that hold
the instrument cluster in place (look carefully - some screws touch the
white plastic directly, and hold the cluster, while others touch the clear
plastic cover, and just hold the cover to the cluster.  You want to remove
the ones holding the whole cluster in, and leave the ones that hold the
cover in place).  Pull the cluster out a bit, and disconnect the electrical
connectors, then you can remove the cluster completely.

The bulbs are held in by bulb retainers from the back.  Simply turn the
retainer counter-clockwise a bit, and it will come out.  Change the bulb,
twist the retainer back in place, and put the cluster back in.