Originally Posted by Alphonso
Also, the derailer does not have anything to do with indexing or not.
Yes and no.....
Index era RDs pull the same amount of cable per shift within design paramaters (Shimano SIS, SunTour Acushift, and the various Campy systems will work within their systems [except for Campy 8/9/10]) but non-index won't. And they have to be coupled with the proper shifters as well.
But a humble Shimano Light Action RD from 1986 will work with the latest Shimano 10-speed cogset given the proper shifters.
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