I have checked ground wire's, fuses, even have the 5 volt reference, pulled the gauge cluster. I'm afraid it's going to be the PCM also...............................
You may have already done this, according to the above description, but my 02 Durango died (literally no power to anything) due to a loose connection on the main "hot wire" to the fuse box under the hood. It is the main power feed (I think) into the box and is hard to miss. I am trying to find an image for you.
I had to remove the connector, clean all the surfaces and then put it back on good and tight.