NOTE: I called my DMV and this is not illegal - at least in the state of Idaho. Call your DMV before attempting this OR have me do it for you :wink:MKI Square Diesel Odometer out of my 81 Rabbit.
Before starting, try to make note of where the needle is in relation to the tiny slit in the brass piece it's attached to, I think they're supposed to line up - I have no idea if this is necessary, but when I finished resetting mine, I felt like I SHOULD have done it. I didn't get a good picture of this but you can see the slit in the second picture.
pull the needle off, stright out, do not bend!

if the brass gear part doesn't come off w/ the needle (as mine didn't), pull that off too

unscrew the 2 screws holding the face plate on, remove face plate

this part is the tricky part so I couldn't stop and take pix, but here are the steps of what I did. My yellow gear was broken/gone but you'll have to remove that gear if you can without breaking it.
#1) bend the yellow gear side of the odo shaft so it'll slide through hole
#2) push/pull the odo shaft out the opposite end of the yellow gear
#3) stop when the shaft clears the first hole and the tumblers are all still on the shaft
#4) Lift the shaft/tumblers up away from the odo #'s and set them all at zero - this will take several tries to get just right.

put shaft back into place part way...

you'll want to check to make sure the 0's line up correctly w/ the faceplate held in place temporarily. If they do then push that shaft back through and bend back into place. It takes some working and reworking to get tumblers back into place and have all the zeros line up perfectly.

put the needle assembly back on, the brass half washer goes between the black cap and the actual needle - otherwise it doesn't sit right.
FINISHED!

PM me if you want to have me do this for you, though it's up to you to find out if it's legal in your state.