I have a b18c swap in my 99 civic si, i am currently using a p2t ecu but i purchased a p73 ecu and only 2 of the 3 plugs fit does anyone know if there is a conversion harness that i can purchase? also i heard that there is a vtec controll wire that needs to be hooked up? Any help or suggestions would be great.

 

your car = OBD2b
P73 = OBD2a (most likely since the OBD2b versions had the immobilizer)

your SI would have all the wires you need for the B18C. (unless it's a GSR and not an ITR)

 

Thanks for the help I guess i better purchase the conversion harness off booslang. Is there an easy way to make sure its an itr and not a gsr.

 

shape of the intake manifold, the ITR curves up, GSR curves down. (from the head to the plenum and throttle body)