I've never done it myself...don't know anybody that has...but take a look at this:
Idiot lights
http://i122.photobucket.com/albums/o.../71AbodyV8.jpg
Gauges
http://i122.photobucket.com/albums/o...ypakwiring.jpg
Best I can say is, compare the diagrams (especially the pins at the dash) and make sure you have the right sending units.
C.J.