1990 integra with a 98 gsr engine

I recently put a 98 gsr engine in my 90 integra, but i didn't do anything to the wiring harness...the engine runs fine, but i know its not running at its full potential. If anyone has done this and knows what steps i need to take to rewire it please let me know!!! THANKS

you need a gsr harness obdII, your probly running you b18c at the mapping for your previous motor

i've looked all over the internet trying to find a obdII harness but can't find one? ANy ideas? Also, im guessing that im going to need a computer to go with this engine right? THanks for the help!!!!