Am I the first to put it on an LS1 (F-body or Corvette)

[The Alchemist]

I have a question about the injector signal wires. I'm running an LS1 that is in a 2000 Firebird Trans AM (LS1 motor) and I found the signal wire for the injectors, but no the ground. I'm guessing it's a common ground for each injector. I was planning on tapping the signal right at the pcm, but I can't find an injector specific ground.

Here's a list of the pinouts on our pcm's:
http://www.lt1swap.com/2001_PCM_CONN_PINOUT.htm

As you can see, I plan to use the pinout for the #1 injector, which is positon #36, but there is no #1 ground.

Has anyone installed this on an LS1 before?