Hey guys . Got a question. I have an 04 GTO with an MSD window switch and I tapped the tach signal from the wireloom left of the clutch under the dash, and I heard I was supposed to run it in 4 cylinder mode but im not sure. Can you help me out on this?

 

That's correct. The instructions say to run in 1-cylinder mode, but it's actually 4.

 

As stated above the 4cyl mode is what you are needing.

-Chris