Speedometer not working

I have just purchased an 86 Legend. The speedometer does not work. Is there any way to avoid the 200$ part charge. Could I pick up one from a junkyard and attach it below the dash somewhere. There has to be some cheap fix to this. Give me some ideas.
Thanks

J

take the speedo out and see if the cable has unpluged it self from the speedo, mine did this and all it needed was to be pluged back in