speed sensor from a GM TBI system 85 sunbird ?

[Stowe, Ted-SEA]

Does anyone know what the speed sensor was in a 85 sunbird TBI system ?

my chilton's manual refers to one in the schematic for this guy, I believe
there is a reference to it being on the axle. I am trying to figure out how
to handle this. I may be putting this system on my mgb, and I need a
substitute.

thanks.

Ted Stowe