Sorry, have been abit M.I.A lately.
Cluster already sold.
So your odometer is not working?
Pull out the cluster, you will see some cogs behind. There should be a white cog which will have a small cog attached to it. The small one usually breaks after time. Look behind the white cog and you should see a sundial like cog i.e cog with a knob sticking out.
Both are joined to the one large white cog.. Which meshes with another below it.
Abel Instruments have the cogs. Don't have the small cog number but the large was 4350.
P.S The description was from memory but you should be able to figure it out. :-)