You can install our site as a web app on your iOS device by utilizing the Add to Home Screen feature in Safari. Please see this thread for more details on this.
Note: This feature may not be available in some browsers.
Funny, today I’m having the same problem on the right rear tire. Pressure shows dash’s. I’m only mildly concerned, but I just bought the car 5 days ago. I will probably wait to see if the sensor picks up a reading eventually. If it doesn’t work soon, I may even try to rotate the tires to see if the fault is in the wheel.