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I set mine in the shade the sun on the tires will raise the pressure by several PSI. We have three digital tire gauges and they all read different. The error increases as the PSI setting increases. We chose one of the gauges and set to read 110PSI at the TST monitor in the truck we then note what the PSI reads on the gauge in this case 114PSI now we know what to set the tire PSI at. It takes some time but you can take the TST monitor out of the truck and use it to set each tire.. When I started one side of the Montana was in the shade and the other in the sun and there was a PSI difference of 4PSI.
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