you can use an s13 transmission, just swap out the s13 speed sensor with the s14, thats all you really need. I dont know anything about kouki transmissions but I bet its the same. just swap the speed sensor from your auto transmission to the kouki 5spd one or check if the speed sensor plug on the kouki trans will plug in. if it plugs in it should work. Speed sensor is all I really plug in on a manual trans, even if I plugged in the other sensors my rev. lights and stuff still doesnt work.