Having an on-board tire gauge is nice. I found out one of the tire’s pressure had dropped. Then, I put in more air and noticed it was leaking. I was able to find a garage open on Friday night and get it patched. (There was a nail in the side of the tire. How that happened, I do not know.)
Without the gauge, the tire would have flattened overnight. I’d have to put on the spare tire in the freezing cold, which I possibly would have somehow messed up. Then, I’d be able to drive it to a place to get it patched.