I have an '89 S-15 and yea the cluster is horrid. I have heard that a cluster from a sunbird will work (supposodly what was used in the Syclones). I haven't done anything with mine yet but I remember seeing pics of some a while back. I think they were on S-seriesforum.com but they might have been here. Thy searchibg in the 1st gen and Inter. styling sections. Here is one of the pics I downloaded, there are alot of ideas out there.
You could get a set of my custom carbon fiber gauge faces They look nice and dress up the boring stock cluster. I can also do different colors for the background and the numbers. Here's a pic of a complete set installed in my truck:
PM me if you are interested. I am in the process of getting the newer style gauge faces(semi-circle speedo and crescent fuel gauge) and should have them available soon.