I ran into a situation with my turn signal indicator lights not working ever since I got the car a month and a half ago. I thought the problem might be in the circuit panel that is on the back of the cluster. Instead I found that some of the sockets were damaged and missing a contact on one side. I bent the bulb wire over to the other side and voila! I now have turn signal indicators again!
If you are having problems with instrument lights not working, check the sockets and you might find that this is the source of your problem.