did the "tach dash" upgrade.
got the cluster from pirate, was from a v6 auto. so basically the wiring diagram said that its a plug and play. aside from needing the oil pressure sender (thanks jerod).
i advise unplugging the oil sender as the very first operation. if you plug a pressure gauge into and idiot light sender, you can have a smoked gauge.
the tach adjustment is easy. the 3rd gen dash tach has a little potentiometer already built in. so all you need to do is hook up a hand held tach, hook up the new dash and adjust it to match.
the potentiometer info came from pirate, sorry no link, but this is the same.
i was able to pull the cover off the cluster so i could remove the tach for pics. after pics and marking the potentiometer for reference i put it back together without the cover and ran it and adjusted it while assembled. barely had to move it as the pics show.
pic 1: before, lousy pic sorry.
pic 2: after. as you can see tiny adjustment clockwise.