says:
"Your Wbo2 input is the pink wire left dangling on the harness, labeled o2, or on the center connector plug, also labeled. Connect your 0-5v output from your WBo2 to this wire."

and: "Your Wbo2 input will connect to the labeled DB15 wire. Connect your 0-5v output from your WBo2 to this wire."

SO- my pink wire is labled o2, but it's not dangling, it's connected at both ends. I'm assuming I should cut it and wire to the end going to the Megasquirt? I dont get the db15 wire part

Other question, grounds on the '94 are up front under the TB, right?

 

He must mean DB37 (the big connector on the MS) because MS doesn't have a DB15 unless you've installed something like a jbperf board, which you haven't.
Maybe he leaves the O2 wire connected at both ends for people who want to get it running on the stock narrowband sensor first, I dunno. But yes, you will need to run the signal from the LC-1 to the MS, and you will need to cut the wire to do that. To the side that goes to the MS you will attach the brown or yellow wire from the LC-1. I believe the sick golden showering poo eaters at Innovate made the yellow wire #1 and the brown wire #2. Double check that though because it's been quite a while since I wired mine up.

Yes. Slightly to the right and down, like I'm hanging right now.

 

DB15s are there on V3.57 MegaSquirts - but usually don't have an O2 sensor wire on them; O2 sensor input is usually DB37 pin 23.