tire pressure monitors

I have the 507 system and it works great. A month or so ago I checked my 5'er tire pressure at the campground and apparently didn't tighten one sensor enough when I put it back on. The next morning when I was leaving the site I had driven about 50' when the alarm went off. This one tire was down to my low set limit. I stopped after I left the park, it was early and I didn't want to wake everyone, fired up my generator and topped the tire off. It is still up after a month so I guess it was operator error - me.

I would not have known this tire was down a little if not for the 507 system.