Heres some pics if anyone is looking for how I did things.
The first pic is the green/blue wire. If you wire your coolant temp like I did, this is the signal wire to your gauge. The green wire is the old obs harness wire, the blue is part of the 3 wire (98 firebird) pigtail.
Second pic- Coolant temp sensor with the 2 remaining wires. I had to cut nelsons 2 wire connector off (yellow and brn i think). Then you hook up the new 98 firebird wires to it. I think gray goes to yellow. and blk goes to brn. Ask me if you need help so I can 100% confirm it.
Third Pic of the rear part of alt. I had my old OBS wire running to it for the gauge, and I have the new LS harness lead running to it as well.
4th pic- Power junction block on firewall. I have the fuel pump running off this with some others including power from the starter lead running up to it, and my subs.
5th pic- Just a pic of where I mounted my OBDII port. It has a really bright LED light on it, so I put it basically lined up with the 4wd shifter so its not blinding anyone when the SES light is on.
To be continued.....(only lets you upload 5 pics at a time)