I keep the sensors in the same position, just easier.
I have the factory installed TPMS, but it is not as specific as the Pressure Pro. It only tells me that there is a problem, but not which tire. The pressure pro alerts me on which tire is low and gives me a pressure reading on all RV and TV tires.
The 2008 F350 was a dually and it was difficult to get the sensors on those stems. Had to lay on my back and finagle with my fingers, exercising much patience.
I found that my monitors were trustworthy, so , no, I didn't loose air when checking because the monitor....monitored. However if I was checking because I was bringing the tire up to pressure, then I over filled them slightly to compensate for losses from gauging. I is easy to let out a little.
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