My 0. 02-
My truck is an 05, I acknowledge the situation may be different for an 06 (making all these words worthless... ) but I'll offer my experience anyway...
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I experienced gauge cluster failure in the mode of electronics don't go to sleep when turned off, and the result was batteries going dead (search my previous posts... ) I had to replace the gauge cluster. Dodge dealer (Auburn NY) did not require it done at their facility. They sold me one over the counter, but they would not let me have possession of both clusters at the same time; I had to bring my old cluster in and surrender it to them at the same time they gave me the new one over the counter.
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Note: On my truck, the keyless entry receiver module plugs into the back of the gauge cluster. If your truck has keyless entry, you may want to make same check. Mine is about the size of a box of tic tacs, black box that inserts into rear near center of gauge cluster. Have to unplug it from old cluster and plug into new cluster. If forgotten, it means taking everything apart again...
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IIRC, the cost of the new gauge cluster I paid was just over $600. My truck has about 39K miles on it. I think it's crazy to have to worry about failures such as this within 5 years of new, at any mileage.