my 85 300dt odometer and trip odometer are not working properly, if i drive like 400 miles the odometer might register like 23 or 30 miles, and the trip odometer wont reset when i push the reset button, i would really like to fix at least one of them so i can see what kinda mpg i am getting, i read about a slipping gear in some posts but i have no idea where to look for that or how to even access the back of the gauges, do i have to take the whole dash out or do the gauges easily come out? any help on this would be greatly appreciated... thanks- Jason

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1985 mercedes benz 300D turbo diesel
1998 VW GTI VR6
1996 VW GTI 2.0
1999 saab 9-3 turbo
1987 300sdl (sold)