[Flakbadger]

Welcome to the forums!
Adjustable grille shutters are a lot of work, if you can do it then great. But if not, a solid grille block is a-ok too. You can make them stealthy if you so desire, and you already have an ultragauge to check out temperatures, so you're one step ahead.
Good luck in whatever you do, and again, welcome!

~Matt