Gauges won't Illuminate?
 

I just installed a new Si Cluster in my '93 DX Hatch today. During the day the gauges worked fine (except the oil temp, but that wasnt working in original DX gauge since the swap last weekend). All was good til I drove it at night tonight and the gauges wouldnt light up. All the little lights like the turn signals and engine light work, but the gauges dont illuminate. There were 3 connections to the old cluster, and they were all connected to the new one accordingly. Any ideas, assuming the ne Si cluster isnt faulty in lighting?

i'd check the bulbs, if they are all good (they might not even be THERE) then i'd check to see if the power to the bulbs is on the same lead as the old cluster. Its pretty easy to do follow the coper lining on teh back of the cluster to the pin on the cluster, it should be the same. While you're in there test the other cluster to clairify that your old cluster's lights work and somethign didn't short out in the process (stupid happens its a good precautionary measure to take)

Good luck dude!