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Hey i thought i would ask you guys since you all have helped me out so much with the bronco. I have a friend with an 89 f350 5spd 7.3 diesel with a re geared rear end. His speedometer does not zero out when he starts the truck its once he starts driving it works but is off by ten or so miles an hour and when he puts the truck in reverse the speedometer gets lower than zero:histerica. any ideas?:whiteflag
 

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shibby
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4,828 Posts
There is no speedometer sensor.

Is it off by 10 MPH at all speeds (says 20 mph when he's going 10 mph) or does the difference gradually increase the faster he goes (off by 1 mph at 10 mph and 10 mph at 70 mph)?
 
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