Ok, let's try this again.

OBD0 B16s are supposed to have a knock sensor, and apparently someone removed yours, which is fine. You'll need to get the P30 chipped so you can run a modified program with the knock sensor disabled. You could also use a P28 (which is the exact same ECU minus the knock sensor board, and with a different stock program in it) chipped to use a P30 program with the knock sensor disabled.

If you just want to rig a ground up and call that fine, you'll have to get a wire from someone else to put in that spot. While you're at it, you might as well put actual pins on the other wires that you say are missing them.. If you can't get anyone to play ball, there are some places on the internet that will sell individual crimp pins or a length of wire terminated with a crimp pin.

PM me and I'll help you out; I'll let you know how. It doesn't involve me actually touching the car, so don't get your hopes up.
I just don't want everyone else asking for the same thing. Cryptic, I know.. but for a reason.