Hello Jim,
I looked up the speed sensor in my manual and it shows two diffierent ones. One is located behind the instrument cluster, according to my book it is for a LS model. Then there is a transmission mounted sensor. Again you test it by taking out the instrument cluster. Raise the vehicle off the ground and support it on the 4 corners with jackstands. MAKE SURE IT IS STABLE. Put a digital multi meter set at the AC voltage scale on the two posts on the back of the cluster. You may want to find a picture of the cluster, the manual is not very discriptive. Start the vehicle and verify that the VSS voltage increases as the drive shaft speed increases. If it does not the sensor on the transmission needs to be replace. It looks as though it is held in place with one screw. It has an "O"ring that must be replaced also. Looks real simple and straight forward.
Good Luck
Copter Steve
