Anybody can install a pyrometer probe in an exhaust manifold (well, there are a few people who shouldn't even try...). Like many modifications you can do or have done to your truck, all it takes is a little knowledge, the right tools and some practice on somebody else's truck.
We did our install on a 2006 Chevy Duramax in the driveway at 10pm while the wife was inside catching up on Oprah. Naturally, it's a good time to not be inside the house.