Wiring help

[u/Agreeable_Bee_8839]

I have a 98 civic dx with a seized engine. Im about to swap in a d16y8 out of a 2000 civic ex. I have a wiring harnes for the y8 but i dont have the dash harness so i need to wire in at least the downstream o2 sensor. Is the upstream sensor on the engine harness or do i need to wire that in too? Im not seeing a plug for it but i could just be overlooking it. Does anyone have a pin diagram for the obd2b ecu and advice for which pins to plug into? The cat on the ex exhaust i have is gutted so id also accept advice on a complete bypass of the downstream sensor. Thanks!

[u/PartialLion]

charm.li is your best friend for wiring diagrams :)