I am wondering, we had to replace our battery last week, got in car to use for 1st time since replacing battery and the read-out for LF tire had a few dashes, PSI followed by a few more dashes!! Husband checked tire, and added air and then took reading manually and it was fine, but electronically still had the previous reading! The other 3 tires all read properly! Being our first Cadillac and not really familiar with "fancy stuff", I am nervous! Is the car safe to drive, or would we harm it somehow? I LOVE THIS CAR!! Husband was out of work for over a year, and we live about 40 miles from near