I meant to send this to the list
I hope Kai's correction puts the controversy to rest. For those considering the
> face changes, more or less all of the speedo's have the same marking locations
> (for 0, 60, and 120) (except as mentioned C's, V-8's and 85mph speedos). The
> odometer and trip indicator and the needle all run off gearing from the same
> input. So, to make them all correct, the gearing off the input is changed
> according to the gearing from the transmission. It all makes sense, and it
>all
> works properly with the proper speedometer for your transmission. Bottom
>line -
> if you want to be acurate get the right speedo for your transmission.
>
> I run TSD rallies too, and have had to get speedometer gearing changed to
> accomodate my car. If you really want it 100% acurate, take off the
> speedometer, and put some tape on the cable like a flag. Drive 1 mile, while
> counting the number of revolutions the cable flag makes, send the info off to
>a
> speedo repair shop (with the speedo) and they can pretty much hit dead on
>within
> less than 1%. They usually tell people to drive 52 ft 9 1/2 inches and count
> that, but a full marked mile is more acurate (and it would be about 1000-1500
> turns, maybe 0.1 miles would be better).
>
> Phil Bates
>
> "Kai M. Radicke" wrote:
>
> > 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
> > it!
> >
> > 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
> > it!)
> >
> > Happy Holidays,
> >
> > --
> > Kai M. Radicke -- kradick1@ic3.ithaca.edu
> > '74 Triumph TR6 with 1001 spare parts scattered about
> > '66 MGB with a 1001% chance of going to the scrap pile
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