My odometer/tripmeter stopped working but the speedometer was still working, so I pulled the unit apart hoping to find striped gears but they were good. I had a cluster out of an '88 or '89 Daytona and thought if the circuit cards were the same I would use that one. Physically they are the same shape but the components and paths were different.
The boards were both made by VDO so I was hoping they performed the same function, I figured I didn't have anything to lose so I swapped the boards wire for wire, position for position. I just took it out down the streetand it appears to work, speedo and odometer/tripmeter.
I know this is no way to march into battle, but it may be an option.
That's the Daytona parts in the pic, but the truck parts are very similar.




https://www.dieseltruckresource.com/...1&d=1228666027

 

Can't argue with results. Good info, thanks.

 

Sorry fellas, but after a highway trip today although the odo and tripmeter work it seems my speedometer is now 20mph low at 2000rpm which should be about 62mph. It seems I traded one problem for another.