Joe Boulay 1/28/2013Hello
Get the front wheels off the ground. Hook up a scan tool . Under generic OBD in data you will find VSS ( Vehicle speed sensor) Put the car in gear and slowly accelerate watch the VSS data . If you see it reading the speed it is likely an issue with the speedometer head. if it does not show you active data this could mean that you have an open wire somewhere in the circuit . If tripometer and odometer work and the speedometer head does not that would definitly tell you the issue is likely in the speedo head itself. Hope this helps.
Automotive Technician & Author