odometer not working

i have a 95 gt 5spd and the odometer has crapped out on me in the past couple of days. is it a sensor i can replace. or is there a way to fix the odometor w/o replacing the gauge cluster. i will try about aneything b/c i dont want to spend the rediculous ammount of money for a cluster. but if u can't fix it is there aneywhere i can get a cool aftermarkit cluster rather than getting an oem cluster from ford. aney help i appreciate it thanks.