Just FYI! If you get the flo thru sensors on the inside of dual wheels they are a huge PITA to inflate or remove, almost necessary to remove the wheel. The non flo thru are also a bit difficult, but doable. Metal valve stems are a must regardless of the brand of valve stem sensors.
I had the TST507 on all 10 wheels, dually truck & 40' 5th wheel, with no booster needed. I used it for 6+ years with only 3 sensors needing batteries then sold it to a friend that had the replace 2 others this past year.
The TST systems have user changeable batteries that can be found at Batteries + & TST has great customer service if needed.
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Full-timed 10+ years
Sold '13 Redwood FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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