I beleive that you can still swap out the face of the cluster with another as long as you reattach the OEM mother boards to the swapped cluster front panel. The mother board detaches from the front panel once you take the white plastic shroud off and you unplug the mother board. Then reattach the replacement cluster.
I would not suggest taking the needles off and reattaching those as it is hard to get them back to where they were. Once you take the speedo and tach needles off, the spring loaded dial pin unloads past the rest pin and is hard to get it properly positioned. Some say let the truck warm up and then take a picture of the cluster and needle positions at normal operating temps for reference to reinstalling the needles. That holds true for the 4 other guages, but when it comes to the speedo and tach, it does not work like that. I am pissed as it is now as I just learned that the hard way and now my speedo and tach needles are off alittle.
So this week I am going to a junk yard and getting another cluster and swapping out the cluster face with needles still attached and plugging in my OEM boards to it. Then I am back to spec, even after I just installed white face overlays. But I rather be correct on my guages then having white face guages.
I do like the link given a few posts ago with that aftermarket OEM replacement cluster. That is pretty sharp, my have to fork out 400 bones to get it.