I think you'll find that almost all european cars switched to a 1000 tpm
speedo in (or about) 1976. It seems that speedos could be produced much
cheaper if they were all 1000tpm and the car manufacturer set up the car to
work with the speedo.
Larry Hoy, Denver, CO USA
1970 MGB Daily Driver ~ 1967 MGB Vintage Racer ~ 1969 MGB Undergoing V8
> -----Original Message-----
> From: email@example.com [mailto:firstname.lastname@example.org]On
> Behalf Of Skye Poier
> Sent: Friday, August 13, 1999 6:42 PM
> To: MG Nuts
> Subject: Re: Speedometer
> Word on the street is that Max Heim said:
> > There is a table showing this sequence on Skye's website, The MGB
> > Experience, at: http://www.mgb.bc.ca/reference/speedometers.html
> Hmm, the information I found indicated that 1976-1980 (blue
> label) used the
> 1000 tpm speedo, but that the 1968-1975 (black label) used 1000 or 1280
> for non-OD or OD respectively. That last bit differs with your post.
> Anyone want to add their opinion?
> > >They did not have different speedos for the o/d cars. All
> cars I've seen
> > >(68
> > >- 74) used the 1280 series speedo. In 1975, the o/d cars went
> to 1000 tpm
> > >(turns per minute) due to the slight changes in the o/d
> gearing. I suspect
> > >the change in o/d gearing was due to the fact that the plastic
> gears on the
> > >1280 units wore out fairly quickly. But, 1975 - 1976 cars
> (non-o/d) used
> > >the 1280. And I have seen 1975 with 1280 and o/d. There was
> some weird
> > >stuff going on in 75 & 76. It all depends upon the o/d unit.
> > >black label units were 1280 and blue label units were 1000.
> From 1977 up,
> > >all cars (non-o/d & o/d) used 1000 tpm. Make sense?
> > >
> > >Eric Swanger
> > >So many cars, so little time
> 1966 MGB The MGB Experience __,__\__ Safety Fast!
> GHN3L-70307 http://www.mgb.bc.ca/ (_o____o_) MGOFR 1.375