Judging from the photo, you have a recent vintage 9-speed MTB rear derailleur.  If so, all you need to convert to 9 speed indexing is a 9 speed right hand shifter.  In Shimano world, 8 and 9 speed MTB rear derailleurs are compatible with road shifters 8-10 speed.  10 speed MTB rear derailleur changed the cable pull and needs a TanPan device to make the cable pull compatible.  And if you're running 8, no need to get into the additional complexities and nuances of 11.

On 11/8/19 9:26 AM, John McBurney wrote:
I wanted 8 speed in order to have non fiddly friction shifting. I heard that wear may be an issue with the lower end 8 speed cassette and if that’s true I may try to convert to 9 speed indexing, although that may mean sourcing a long cage road derailleur.

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Steve Palincsar
Alexandria, Virginia
USA

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