I assume you have tried your dimmer control for the brightness of the cluster?
At night, moving the dimmer control has no effect? What about the HVAC and radio modules? Do they change when when you adjust the dimmer?
Checking all fuses is the first step, but if your I/P doesn't light, and the radio and HVAC lights up ok, sounds like a cluster problem....
Or is this only a problem in daylight?