Groundspeed/drift indicator needed.

Hi all!I am a student living opposite Duxford IWM and have been restoring a Green Satin radar array to display/demonstration condition. The current project can be viewed here: http://uk.youtube.com/watch?v=YNaoZlqg04A , and I now need to obtain an indicator with drift (heading) and groundspeed dials. The servos that control the drift indicator are powered off of a 26Vdc line and are operating, so the final stage will be to provide simulated groundspeed signals.
I am working to a budget, but if anyone has a Green Satin indicator or similar they could part with, please get in touch!

Kind regards, Robert B.