Gauges are nice, but if you have a solid tune and are not going to flog the hell out of your Stang, they are not critical. I got my gauges about 9 months after my SC install,,,,and I look at them...but not like I live by them.
You'll definitly get different viewpoints on this topic.
I would put those dollars first into brakes, and then tires for your SC set up. Even the suspension mods can wait.
Did not see what you have for brakes.
2008 GT Premium, MagnaCharger TVS 1900, Brembo Brakes, Whiteline Watts Link, Koni Yellows, Steeda Sport Springs,
J&M Extreme LCA, BMR Relo Brackets, FR500S Axlebacks, TCI Shifter