That kind of system would be nice! I've walked around the truck manually checking the pressure only to find out the 4th on is 20PSI lower that the rest, but looks damn near the same. I leave the spare for last so I don't have to mess with dropping it if the problem is one of the others. lol Would save some time if I knew right away it was the left-rear, or spare for example. Not to mention, you could see all pressures on-the-fly to make sure they are the same for better mpg and handling.