Just remove the gauge cluster and behind it you just find where the bulb is, twist it out and replace it with another bulb. I THINK its a 198 bulb, you will have to double check that, don't take my word for it. But its a fairly simple job.
I think its 2 screws on the outside, 3 after you remove the plastic outside dash and some shifting around to get it out of hte hole. You CAN unplug the cluster and work from there but you don't have to, it might make it easier for you to see behind it and remove the bulb.
Good luck on that, I think if you run a search for it there are some detail pictures running around. OR try searching
www.team -integra.net [Remove space and past link.]
GL