I just bought a '99 with a compass/altimeter/temp/baro. pressure thing mounted in the dash at the very top of the front center console. The thing is, it seems all out of whack. The compass appears to work OK but everything else (altimeter,temp, baro. pressure) are way off. I was wondering if there was some way to re-calibrate it. I don't know if it's factory or not but it looks like it is original to the car. Any thoughts on how to get this thing back to original working order? Thanks.