also....
the two fuses that have to do with the Instument Cluster Illumination are supposed to be 5 Amps and 15 Amps. So there should be no reason what so ever to put anything higher than that in there.
the 15Amp fuse is for the tail lamps, parking lamps, side marker lights, Inst Cluster, Liscense lamps. So if that is the problem fuse check all that wiring.
the 5Amp fuse is for the Inst Cluster lamps, radio, climate control, ash receptacle lamps, floor "PRNDL" Lamp. So if this one is the problem fuse check all this wiring. If you have done any changes to your radio recently such as a new install, this could be your problem