alright i have a 94 civic vx hatch and i just installed a 93 b18b. Is there any rewiring that has to be done? We used my civic harness and and all the plugs plugged up except one. Does anyone know what this plug is for? Theres a sensor plug on the intake manfold on the very right runner...and i have two plugs to use for it i can use one but the other one just hangs there..does anyone know what these two plugs do?

 

You will need to convert to a 4 wire O2, other than that everything should plug in given that you used all OBD1 parts. At most, you may have to shorten/lengthen some plugs.