Tire pressure monitor valve stems
 

My 2016 SRX has 51,000 miles and original tires with good tread. The dash readout shows tires around 31 to 32 lbs.which is below the recommended amount. I have a cheap tire gauge and a higher quality tire gauge. Both gauges agree that I have all tires at 34 lbs. Does anybody else get faulty readings from their tire monitor readout ?