It has it's own bulb. Don't replace just that one, do all seven at once. It's about $20 for the bulb set.
The dealer will do them for you for about an hour's labour. Or, buy the cluster removal tools, and do it yourself. You slide the removal tools into the gap between the cluster and the dash at the top, and use the hooks to release the cluster and pull it out.
Replacing the bulbs is simple after that.
A caveat: this is not a time to be ham-fisted, as you can break the cluster, and you don't want to know the price of a new cluster!
1998 C230 "Black Betty"