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Message: <blockquote data-quote="RossKean" data-source="post: 1467055" data-attributes="member: 19880"><p>I don't doubt that the internal sensors are better - especially if you are relying on temperature readings.  The external sensors are easier for tire changes and easier to replace the batteries if needed but straight stems are recommended because the sensor weight can make for too much uneven pressure on the seal causing leaks.  (Besides, I like the idea of the unit I linked having the TPMS, a voltmeter and a USB charger.  Also no batteries in the head unit to replace.)  Might be utter crap, but only one way to find out.  The T valve stems are convenient for adding air without removing the sensors but I am not a big fan of the appearance.</p></blockquote><p></p>