93 240 wagon: There are 3 wires running to the 'L' connector which attaches to the speedo in the cluster: Blk, Blu and striped. What are they?
Does the odo get its impetus to work mechanically from the speedo drive or does it get an electrical impulse seperately from the speedo? In other words, if the speedo works and the odo doesnt, is it mechanical or could it be electrical?
Any help appreciated.

 

Black - earth (ground).
Blue- ignition switch.
Green/white - speed sensor mounted on rear axle.

The only electrical impulse is to the speedo. The odometer has plastic gear wheels which often break.