I believe the screw is on all VAF meters. Not having personally seen under the hood of a gen 2 GT I couldn´t say for sure. But as I said in the article there is a plug covering it up that you have to drill and stick a screw into to pull it out. It should be toward the outlet side of the meter up on the top. As far as turning it, I screwed it all the way in and counted the turns to establish a baseline then I turned it back out the same number of turns. Mine was 2 and a half I belieive. Ater that, it´s all up to your car as to how much it will respond to turning it it one way or another. Best bet would be to make some runs at the local strip or get a G-Tech meter. Also an Air Fuel guage helps a bit too.