There's this little rectangular digital display directly under all of my gauges (tach, fuel, speed etc.) and I cant figure out what the heck it's for. There are 2 small nobs on either side of the display, one nob is for setting the clock, and one nob is for reseting the trip meter but what the heck is the number read out for? Some times is reads zero, and other times it goes up to 7 and I think it might have gone down to a negative number once but I don't quite remember.

My wishfull thinking is that it's linked to my cars horrible performance right now.