Easiest thing to do would be to swap in a guage cluster from a Zetec equipped Focus. Supposedly everything plugs right in and works. Go to www.focaljet.com and look around in the SPI forum. They should be able to help you out.

Fordman could hook you up with a price on a guage cluster or you could find a used one at GreenLeaf with mileage close to what you have on your car already.