The panel has 9..I think...small bulb assemblies plugged in at the rear of the cluster. I think they are specific Jeep only bulbs. The Sticky above, "Liberty Service Manual", has section 8, wiring diagrams (about 42MB). This gives you the circuit diagrams and also describes how to take the panel apart and remove the bulbs...this download is for 2002 models, gas or diesel, LHD RHD etc. but should be valid for later year models.
How are you going to dim the panel lights if you use LEDs? Fit a complete seperate circuit?