They have an accurate factory one. There is really no need to add gages to these things. They already have everything you need. And really engineered quite well for pulling.If it has an automatic transmission, I'd install a trans temp gauge no matter how big the cooler is.
I don’t remember what page it’s on, but it’s in there. Not that it really matters, they make about 35 PSI and that won’t hurt the engine or anything at all…Thanks for all hte replies. I was thinking I needed a boost gauge, I am unaware my truck has this (2019 3500 Cummins 6.7 high output).