Originally Posted by boomdaddy
What if I put a 99 gauge cluster in my 2004? Can I use an older cluster in the newer truck?
No. From what has been discussed in the past, it seems that the odometer reading comes from somewhere other then the cluster in 2004-05, probably one of the many onboard computers. Where as in the 2003 and down, the odometer was a mechanical gear driven mechanism that received its signal from the speedo.
EDIT: After rethinking, there is a small possibility that the odometer would still work but noone that I have heard of has taken out a newer cluster to even see if the plugs would fit. And like Neil mentioned, all the dummy lights are differnet and there are even some gauges removed in the new clusters. So I am still leaning on the side of it not working.