Don, I checked out the web site and this is the first time I ever saw this. A friend of mine has the Duran tire pressure product that I like and think I will order it. Check out http://www.Duranmfg.Com/rvtirepressuremonitors.htm Garvey Hayes 31ft. Airstream '90 Chev. crew cab long box 454 big block.....158,000 miles !