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I can only speak to the Pressure Pro System. That's what I bought and use. Since I have a dually, I need to monitor 10 tires. I have no problem getting a quick reading on all 10. Of course, when I am not pulling the Monty, just the six truck tires are monitored.
The system is very easy to install and set up. If you can screw a stem cap on your tire stem you can screw this sending unit on the stem. Just plug the monitor into the 12V power source do the simple setup program and you are set to go.
As to the value, everyone will have to determine for themselves on that one. Since I have had 4 flats, two causing extensive damage to the coach, I value being able to quickly monitor all my tire pressures at every rest stop without using a tire guage. I value an alarm that will sound if the pressure on any tire gets too low or too high. I am sure much of the damage I experienced could have been avoided had I known the flat had occurred. For me this all makes it worth the price.
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