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On our first trip with the TST 507 system. I set pressure in the fiver tires at 110 psi in the cool morning before moving the rig. While heading North that morning, the right side tires were showing 120-125 psi while the left side was showing about 5-10 psi less. Obviously, the sun shining on the right side made the difference. I don't get concerned unless the pressure is going down while temp is going up. The factory system on the TV is not as accurate as the TST.
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