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I would be interested in knowing that myself. I just bought a 99 f250 superduty v10, and the trip computer/compass/mpg/mte hasnt worked since I've had it.
If this is the type that is in the overhead console, you might have the chronic problem of the solder joints going bad in the unit. I believe there are some write ups on the web about re-soldering the circuit board to fix it if that's the same problem.
