www.pokerstove.com
Download and start testing different %s.
Generally hand reading is the last thing you'll pick up as a poker player.
SNGs you really won't be in a good position to assess hand ranges because the table dynamic shifts so much as it gets shorthanded. Stack sizes and other core factors will really dictate things more than historical play of that player over that single SNG.
Also for PAHUD you can customize the # of hands required to display, to as little as 1 (which I would do, simpler for me).