I'm not 100% sure now that I think about it. I'm not sure if I left the /6 engine harness in the car (we installed a GM module) when we did our V8 swap or if I took the V8 harness. I will look thru all of my before and after pics to see if I can be 100% sure. If there is some other way of identifying the V8 harness verse the /6 harness, someone on here will know. I'm just not sure.