If you are installing a factory rallye guage set up, then you only need to switch a couple of wires on the electrical connector to the guages. I did this when I converted my car to factory rallye guages.
Once you have removed the cluster from the dash look at the electrical connector to the old cluster.
There are numbers 1-6 on the top and numbers 7-12 on the bottom. Switch number 5 (tan wire) with number 7 (brown wire). To remove a wire, go from the front (the side that plugs into the cluster) and insert a small flat screwdriver under the pin to release the tab that holds it in the connector. Be sure to expand the tab out before reinstalling it into the new location (make sure it is locked into position).
You will also have to replace the oil and temperature sending units. You can purchase these from Performance Years, Ames, Year One, NPD, etc.
