speed sensor problem

[readers ride]

I have a 1982 crossfire vette while driving it the check engine light comes on. Ive check the code it was 24 vss . I took the cluster out cause the speed sensor is next to the spedo. and found the wires but the one thing I cant figure out is where the yellow box connects to the wire harness? Can anybody tell me where the connection is and what color of wires Iam looking for.