I recently upgraded from 9-speed Sora levers to current gen 10-speed 105 (5700 series), and I find myself missing the optical gear display.
Apart from swapping out my current computer for Flight Deck (or looking down at the cassette...), is there any way to modify my setup to easily see what gear I'm in?
My 9-speed Flight Deck Tiagra levers look like it might be possible to swap in the optical display from the Sora levers, but the design on the 105s is different enough that I don't see where an optical display could even go. Is there any possibility of modifying the levers themselves?
What about the old-school inline gear displays that could be spliced into the cables south of the levers -- do those still exist? Are the compatible with current-gen 10-speed?
Are there any other options that I'm not thinking of?