I'm another fan of the Road Morph with the gauge. I checked it against my shop gauge. It's accurate enough that I can leave the gauge at home. Fewer ounces to carry over mountain passes. I wouldn't carry a CO2 backup for that reason - a few less ounces. If I brought something to cover every possible breakdown my load would be ridiculous (it's bad enough as it is.) I've never had a pump break, but if mine did I'd ride to the next town and order a new one. If I got a flat I'd hope for another biker to come along, or stick out my thumb.

I did have to replace a pump once. I was taking a training ride during the drive to the start of my tour. I'd stop at a campground, get up the next day and go for a long ride, staying in the same campsite a second night. It's a nice way to travel to the start of a tour, if you have the time. Anyway, when I was putting my bike on the rack after the ride I set the pump down on the bumber and forgot it. It fell off on the drive back to the campsite. When I got to a friend's house I had a new one overnighted. Stupid me, but not a big deal.