1966 Crown Coupe, 2016 200 S AWD, 1962 Lark Daytona V8.
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Is there a 7-digit part # or tooth # on the plastic gear? What color is it?
It would make sense to have manual and automatic gears the same, but they might not be.
You want to rotate the speedo gear adapter so that the pinion gear meshes with the tailshaft worm gear.
It sounds as if they are not meshing.
These gears can wear and will visually show a slight concave across the tooth crown (they should be flat across). Adjusting them closer to the worm can restore speedometer operation.
It would make sense to have manual and automatic gears the same, but they might not be.
You want to rotate the speedo gear adapter so that the pinion gear meshes with the tailshaft worm gear.
It sounds as if they are not meshing.
These gears can wear and will visually show a slight concave across the tooth crown (they should be flat across). Adjusting them closer to the worm can restore speedometer operation.