i have a a6 wire harness and a y8 swap. my question is where do you or how do you hook it up? for now i am running a pm6 ecu. i have a p28 and jumper but i have to tune it. so i just wanna know if i can use the a6 harness or do i need a y8 harness?

 

You always keep the stock harness, short of k/j swaps. Not sure what you are trying to hook up because neither an a6 or y8 has an oil pressure switch. There is a 1 wire oil pressure sending unit however.. and is this a stock y8 you are using? if so their is really no need for a tune, the z6 and y8 are nearly identical.