ok, so a buddy of mine is putting in an ls wiring harness into a 90 civic si, the reason for it is cause the is not engine harness in the si to begin with. so he is installing an ls! anyway, he got it all pluged in except for the part that goes to the twinky box, the si side is rounded if i remember right, and the ls is square. anyone know what to do about that? any help is appreciated. thanks

 

your supposed to use the stock si harness on the ls engine

 

yep, what he said.

good luck trying to get it to work with anything other than the stock harness.

 

yeah thats what i thought. thanks

 

well, afaik there is no twinky box in the engine bay, so at least a picture of what you're asking about would be a good idea if you want a helpful answer.