Ram_SRT-10

Alright so after doin some reading and find out that the 1990 wiring harness is a breed of its own i have removed my grid heater control box and one of the wires goin to this box is the black/white wire coming off the vss i have tested the white/orange wire and it has 5 volts with the ign on question is does anyone know if i have to ground that black wire or put it to 12v or what to get my speedo to work again? I can just start guessing if need be but I would rather not fry my cluster or vss. Just hoping someone else may have done this already

Ram_SRT-10

Incase someone else needs the information you ground that black/white wire