'92 a518 vss to '97 OBD2, compatible?

The a518 I have is a 3 pin style, but my harness is for an electronic trans. The motor had a 46re attatched when I bought it, which I sold shortly thereafter. If the '97 computer won't work with my transmission, I was planning on changing the harness(es), PCM, and sensors over to OBD1. I understand the OBD2 is considered a superior system, but I'll be leaving this engine stock, and I figure this is still the easiest way to keep my speedo. I've got the ATSG manual at home, but thanks for the link. Gives me some new reading material.