TrailBlazer4X4 -

Pokeno asked a good question regarding what fingers the tingling goes into. It helps narrow down the possible locations within the neck or peripheral locations. You also need to get an MRI to rule in (or out) that the compression is coming from the neck. Another test that would be helpful is an EMG/NCV. It might help pinpoint the problem, but the EMG/NCVs are not always positive despite the symptoms.

Good luck!