Now, before you get all mad and tell me to search I have, for about 2 hours, and I get diagrams and such about the install but no good explanation for what I am looking for. It was a gift, and I am going to use it. I know it is "useless" to some extent, that is not the purpose of this thread. I have a 2002 WRX. I know that you are supposed to hook the 3rd wire, (not power or ground) to the ecu. I know it is supposed to be hooked up to line B-17. in group "B-135". What i dont know is which one this is. My ecu looks different than any of the diagrams I have seen. Does anyone have a clear picture of which wire this would be? or what port? or anything? Any help is appreciated.