this is a noob question. i have searched and i cannot find the answer to it. if i have an obd2 ecu, do i need an obd1 and obd2 ecu or do i just need the obd1? cuz i am looking at the wiring harness and i don't understand how it ties together.

 

First you need a OBD-1 ECU

If your car is OBD-2a or 2b, You need a Harness which converts your

"OBD-2Harness to a OBD-1harness" so that you can plug in a OBD-1 ECU

 

so all i need is an obd1 ecu and the harness right?