I installed FoboTire today on all four wheels. This is an amazingly cool device and it make possible on-the fly readings of the pressures in each tire. In fact, I'm sitting in my house at the very moment taking readings of my Model S tire pressures, even thought the car is parked 100 feet away outside. FoboTire is a bluetooth device and comes with a smart phone app for IOS and Android. It took me about 10 minutes to install and set up. At $179.00 the peace of mind it provides is worth every penny and when I get low pressure tire warnings they'll be based on my own settings, not Tesla's. Best of all I'll know which tire is low without having to do the tire to tire shuffle required by Tesla's inadequate system.