How accurate are the tire pressure sensors? When I take a reading with my digital gauge(which is supposed to be accurate to +-.5lbs) I get 35lbs, but when I use the computer to check the pressure they read 33 or 32lbs. Which one should I believe?

 

Can you have the digital hand held gauge calibrated? You really need to compare readings to a "standard" If you really want to you can purchase a grade 1a boron tube pressure gauge from some place like McMaster Carr. Or better yet borrow one because they aren't cheap.

 

Also remember that the pressures are going to increase relative to speed but I've checked my monitors versus my digital gauge and found them to agree well.