How often do we REALLY check tire pressure? For those of us with cars that don't have a built-in tire pressure sensor, that's pretty slick. The gauge caps that go to the valves are a little larger than I expected, but not excessively. Installation was easier than the instructions said. Solar power! Brilliant! No cables or batteries to manually charge. I put mine next to the oil change sticker and leave the display off most of the time. It doesn't need to be turned on when I'm not in the car. It's winter here, cold and snowy so the PSI might be a little different, but it's within 1 PSI of what my compressor says it's filling the tires to. for a few weeks, but I liked the idea so much that I ordered another one for my truck.