86 Chevy vss wiring questions

[mx34n4]

Somebody please help... I am installing a tbi from an 88 model into an 81 model that was a diesel. I have everything done except the vss signal. I am installing an 86 model gas gauge cluster and its has the vss, my question is this...Does anybody know how to wire this vss into the ecm? it has a 4 wire plug and i have the pigtails. One wire is yellow, one is brown, one is black, and one is pink or red with a black stripe. Conventional wisdom would say that the pink and black are power wires and the brown is a signal wire to the vss input and the yellow is a signal to the cruise module. I tried it like this and get nothing. Also, does the optical sensor emit light to recieve back off of the rotating blades? Is the sensor 12v powered? Maybe I have already cooked mine. Thanks for any help.