I just checked the tire pressure on my 02 MCS and got two different readings on the same tire. My Accutire digital read 33.5 and on my old mechanical Meiser Accutire read 28. Any opinions as to which I should trust and how might I calibrate them so they agree? Any info would be appreciated.

 

How old is the battery in your digital gauge? Put a new one in a see what you get.

If your mechanical gauge was going out, I would think it would show a higher reading from a worn out pressure spring.

 

You wouldnt have this problem if you only had one gauge.