What you need to do is take the cable out of the speed sensor. Put a drill on the drive cable. Have someone observe the speedometer when you turn the cable with the drill. Try forward or reverse. If the MPH needle doesn't move then it is either the speedo head or the drive cable. If it does register MPH then you have a problem with the drive or driven gear. The speed sensor is to tell the PCM the MPH. It's a shame you wasted your money. If you need further help contact me at swaths3644@mypacks.net