I have a 91 civic hatch and i am rewiring it to be a si with a hf wire harness. i need help cause the plugs dont plug up. the dx female plug is bigger then the hf and si plug. so if anyone know how to rewire or have pix of some rewiring done please let me know and give me some info. thanks..

 

search please, but here you go. very informative site.

http://www.fourthgenhatch.com/mpfi.html

 

you have to use your exhisting wiring harnes and modify it.

 

correct, you use the dx harness and modify it by adding a few wires and the injector plugs from the hf/si harness.