Wow.... Well, I think '92 was the crossover year from cable- to electric-driven speedometer.

Could you please look at your transfercase and tell me if you have a cable or wires attached to your speedometer drive?

This isn't really the best picture, but here is a Cable-driven speedometer gear on a Gear Drive t/case. Assuming you have an automatic, it will be in the similar location, near the rear output flange, but it will be a bit larger in diameter.

Let me know if it has a cable threaded onto it or if it has an electrical plug coming out of it.