ive seen this done on tv, you need a old cluster, junk yard, gut it, make a wood plate that fits inside the cluster, drill the holes for the gauges where you want them to be, cut the holes with hole saws, get whatever you like to put over the wood. (trim wise, wood grain or what ever) then the joy of wiring it all up.

your stock cluster is at least 4 inches thick. you should have plenty of room to work with.