Jason,
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. Typically,
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
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