Speedometer kinda works, but not really at all

[95stang427]

I drove to work just fine. Went to go home and no sppedometer from that point on? It will bounce between 10 and 20 when i am doing 65. Not to sure what the problem is.

 

[Roadrunner]

could be your vss http://freeautomechanic.com/vss-vehicle-speed-sensor.html.. use this site to diagnose