This is what you use to build a custom gauge set for you light truck, its covered on the website,
Custom GMC Instrument Cluster, and shows the one I built for my 1965 2500, but it will most likely end up in the Rescue Squad now.
When building one for a pickup you need to make sure you have the 100 mph speed-o, some of the bigger trucks have one that only foes to 80 mph.