I recently purchased a John Deere 1530 diesel and have been going through it. The tach / speed gauge was smashed and the drive cable missing from inside the sheath, so I got new parts. However, when I insert the cable into the mounting hole in the bell housing, it does not engage anything. Is there a serviceable drive gear? I assume based on the location that the cable should be driven by a gear that's driven by the flywheel teeth, am I on the right track?