How can i convert my 91 Integra LS into OBD1 without a jumper harness? I have everything dropped and fitted, i got my p28 ecu and my old pr4 ecu. The problem is i dont know how to convert from obd0 to obd1, i am willing to do the wiring but i have no instructions? I understand that you can buy a jumper harness but i am super broke and i rather wire it myself anyway. My wires dont have codes on them such as "A12 or B13" and they are all black, so how do i know which wires are which. If i look at the 3 wires in the order that they plug, clip side up, how does there chronological sequence go? (For Example: Clip side up from the plug all the way to the left, it begins A12-A18 top... i know the even numbers are on the bottom and top are odd numbers?) Any help would be greatly appreciated.