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This may be out of the realm of this forum but I'll throw it out there. I am trying to find a wiring schematic and or service manual for the above listed truck. I am specifically looking for wiring information that concerns the speedometer. If anyone has the information or knows where to get it I will be forever grateful.
I can direct you to a Tech forum for tech question for your Big Truck.
The speedo may be the same as an F350 which can be asked in the 87-96 truck forum.
Otherwise, the General autromtive discussion forum would be a good place for this question.
You can come back to this thread and edit it into an Personal introduction