Ok. So having checked and double checked the teeth, gears, connectors and pins on 3 separate boards, all speedo and entire cluster working except ODO/Trip, I now am going to check the boards themselves to see if all three have a short or bad connection to the ODO.

1) Which pin receptor on the full-moon connector is from the sender unit on the transaxle?
2) Has anyone else successfully done this (repaired a failed odo with everything else working including sender?)