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The actual gear displays with a small number just above and to the left of the D. It does this in all dash display modes on my 17 GS. It switches to a large number when in manual mode.
This might not be an option on stingrays, but all the GS and Z customer cars I tune have it and I'm a little jealous. I might take a chance and try flashing my cluster and see how it goes.
Gear shows (when in drive) on Stingrays as well. I have a 16 w/Z51 (though I doubt it makes a difference) and the current gear shows. Though I don't recall the setting, you can also view whether the engine is running in 8 or 4 cylinder mode.