(i tried searching first...)
what ecu pin can i splice to get the 02 reading from?

Tom

 

You can splice into the plain white wire. There are three clusters of wires, and it's the cluster on the bottom right of the ecu.

Note: there are tons of white wires, and a few of them look like they are plain white, but they aren't. My friend warned me of this, and I thought to myself "ah, it's easy...I'll figure it out the first time"....Well I ended up chopping up two wrong wires before I got the correct one. Just make sure you find the all white wire.

 

I think its the THICKEST white wire......look for the bigger white wire....becareful there is white w/yellow spots on mine.....threw me off, just get a T-TAP its easier and better, so you dont need to splice.....late

 

what year is it, mine is a 94 ls, the bottom harness, or third harness from the ecu has a white wire with a red line in the middle, that is the wire recommended from honda to get the best reading..........