Are you checking the pressure on your DIC as you're driving? The pressure will change as the tires heat up due to the friction of rolling around. What type of manual gauge are you using to check the pressure? If it's one of those one with the rod that pops out at the end, those aren't deadly accurate to begin with, so to be off 2 psi would be acceptable with that. Now if you're using a digital gauge, that's a different story.JF7FSU said:I checked my 19" tires manually and they are all set at 35psi per the manual. My DIC usually reads 37 PSI when I am driving. sometimes as high at 39. Is anyone experienceing this as well?