Bicycle Mechanics - What is this other opening on my shifter?

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digger
08-24-08, 09:39 AM
I was wondering if anyone could tell me the function of this other opening on the shifter in the photo below? (Shown via pen).

Retro Grouch
08-24-08, 10:39 AM
Some Shimano shifters used to have a "Central Information" deck. It was a mechanical, cable driven, gear indicator.
z415
08-24-08, 09:34 PM
Yea, that deck kind of looked like a miniature dashboard looming over your stem.