Can anyone tell me if this is more accurate then a medium price digital gauge. I have two gauges and they both agree my MMI system is understating the tire pressure by about 3lbs. I'd like to think the one in the car is more accurate but I don't want to ware out the new Blizaks any sooner then they'll go on their own, ya'know?

 

The external guage is usually more accurate, the tire pressure sensors are generally off 2-3 lbs of pressure.

 

Thanks so much.