All instrument cluster lights are out

I have a 94 Altima GXE and all the instrument lights including the clock and climate control go off and on at random while im driving. tried the fuse and the connections (unlikely since they are all going out). i cant find the relay for this group and im not sure if its the light switch itself thats causing the problem. All the gauges/climate controls still work and the clock keeps time, just no lights. Any help?

possible bad contact through the interior light dimmer. when it happens move the dimmer control throught a complete range quickly a few times and see if changes anything.