VSS buffer different from analog/digital?


I'm changing my dash over from digital to analog. I've rewired the C1/C2 connectors but I didn't know if I needed to change out the VSS buffer or not (not sure what its function is). If I don't have to stand on my head anymore looking up under the dash I'll be happy. Thanks for any info,.
I think I figured it out. From what I've found, there were two VSS buffer boxes - a yellow one and a green one. The yellow one had one output which went to the ECM. The green one had two outputs and was for cars with cruise control so one went to the ecm and other to the cruise module.