Just received this gear indicator, have not installed it yet. It is advertised for the gen 2, but I do not see why it would not work with the gen 1.
http://www.ebay.com/itm/121325993344?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
It is much cheaper than the GIPro, yet seems...