wizardz had this to say:
>So... all I can think off...for all the variations I can SEE in the speedo
>bodies, and yet
>knowing the later years didn't require a speedo change for O/D and non O/D
>Is it possible/probable that the right angle cable drive gears have
>something to do with
>the later cars not needing a change over?
Well, Moss shows two different speedo drive pinions for the late
overdrive, so that may be what was used to compensate. The OD serial #
indicates which one was used.
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the red one with the silver bootlid.