Yup go for it...
I was wrong about the speedometers. I saw all the replies about the
internals of the gauges being different and that is not at all what I
recalled from memory, so I went and found Paul located our notes and damn
Here is the scoop.
The SN1280/XX is indeed the overdrive version of the SN1000/XX, and their
internals are different and the swap can not be accomplished with a simple
face change. However, there is another gauge that were fitted incrementally
also in OD cars and the faces of SN1280/XX and SN1280/YY are
interchangeable, the apparent difference is a change in (to quote Paul) "two
dots or some foolish detail."
And of course XX & YY are postfixes of additional numbers ie. 03, 13, etc.
Sorry for the misinformation!
(I'm not sure whether I just cleared up the confusion I caused, I worsened
Kai M. Radicke -- email@example.com
'74 Triumph TR6 with 1001 spare parts scattered about
'66 MGB with a 1001% chance of going to the scrap pile