The TireMinder i10 at first glance seems to be a bit of complicated overkill, but once you dig into it at little bit, you realize that it's a valuable piece of safety gear for your rig. It's a well made kit of parts that gives you a real time read on the pressure and temperature of each of your tires.
You mount the signal booster unit between the tires and your screen, somewhere on the front of your trailer underneath, but protected. We wired it to our trailer wiring harness so it's only on when we are plugged into the truck. The battery powered sensors screw onto your tire valves and they sync up with your display. It's as easy as that.
You can set alarm parameters so you get notified if something is not right. We find ourselves keeping an eye on the temperature readings more than air pressure. So far, we recommend this unit.

X-Sense WiFi Smoke Alarm...Easy SetUp with X-Sense App...Interfaces with Wifi onboard and notifies via iPhone or any internet connected device when there is smoke. Great small unit for monitoring from any location. CO detector also available.