Mine's racing shift harness/ shift indicator?
 

If you check out http www.mines-wave.com there is a racing shift harness/racing shift harness + shift indicator on sale for automatic Zs. I cant read japanese and I cant seem to find any info on what it does. Anyone can clarify?

Does it switch the up/down shifting for the manumatic mode?

^^
yes

the mine's auto shifter device allows you to "up shift" when you move the manumatic lever DOWN..

it just switches the wiring...

yeah it just reverses the wiring and puts the + and - on the opposite sides to match. Super Street has this in their new products section in the issue with the AWD Z on the front.