gta87ls1

I just recently purchased a 1992 350tpi from a camaro. I got the harness and computer with it. Right near the connectors to the pcm theres a clear looking connector with about 16 wires. What does that connect to, im assuming it would be for vats which i did not get with it. Also the vats module is there another harness from that to the key? Any help would be appreciated. Also the connector on the firewall on the drivers side, should mine from my 87 trans am plug right into that with no problem or did they change that harness over the years?