Thanks to all for responding to my request for help regarding my malfunctioning speedometer. That said however, the challenge still stands. I have since done the following but unfortunately, the problem still persists:

(1) I had the differential speed sensor replaced with a new one. (Polarity wiring is correct.)
(2) Wiring from the speed sensor to the speedometer was checked for continuity and was deemed o.k.
(3) I removed the entire instrument cluster and replaced the malfunctioning speedometer with one that I know worked previously.
(4) I checked the OBD for possible fault codes but only received 1-1-1 code indicating that no faults were recorded.

The speedometer and odometer are still not working. I am rapidly running out of ideas. Is there a primary fuse that protects the differential speed sensor circuitry? If so, can anyone advise me regarding its number and location?

Any further advice will be greatly appreciated!

Many thanks!

OnlyVolvo