lol you guys are assholes
if you have an si you dont need the teg harness, just use your stock si one, it will plug up fine. The teg ecu should also work fine, and plug right up since a 90 teg is obd0. although the bolt holes wont line up like stock, just cram it in there
also try snagging the axles and intermediate shaft from that teg as well as you will need those. you need to take a small metal piece out of your hub, and a small plastic ring off the outside of your axle as well....oh yeah you will need the aftermarket mount kit...
www.jdmshit.com sells hcp mounts for pretty cheap, check them out