Bought a tire pressure monitoring system and that thing saved me a WHOLE lot of trouble. Got a nail stuck in one of my steers. Created a slow leak and the Doran PressurePro altered me that I was losing pressure. I hate to think what would have happend if I didn't have that system installed. And the guy who sold it to me, I believe that gentleman's name was Phil Cunningham, stayed on the phone with me until I got my system installed in case I had any questions. And there's some free stuff they give you too with each other. If anyone's interested in more information, Doran's number is 866-816-7233.