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ampmop: The much less costly alternative solution you referenced above has several disadvantages compared to the more elegant solution:
1. You can't see the warning signals when you are in the vehicle. Only when you are at a stop and otuside the vehicle. So, if you develop a leak at speed, you won't know until too late.
2. You don't have an alarm that attracts your attention, potentially in time for you to get to a tire dealer before you become immobile.
3. There is no temperature monitoring or warning. Example of significance: even with "normal" air pressure, tires can overheat when carrying a lot of weight in the bed or pulling a trailer.
4. There have been complaints from some that these much less expensive tire valve caps sometimes LEAK, causing the very problem you are trying to prevent. I have not had personal experience with these, so cannot verify that the roblem exists, or its freqeuncy of occurrence if it does.
Jim G
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