I would go ahead and take a pic of your wife;s cluster while the car is at full running temperature. Open up your cluster and remove the needles. Make sure the gas tank is full. It's much easier to get the needle back to where it should be with a full tank.
After that, run your car to full operating temperature and place the needles according to the pic. As for the speedo, that'll be a bit tricky. If you can`t get it spot on, drive next to someone at about 30 mph or whatever and stay even and then push the needle back on at that speed.
As for OEM parts, I generally go with
www.newtakeoff.com A lot of Ford on there. Good luck!