I should of put the innovate link up.
http://www.innovatemotorsports.com/products/lm2.php
This one is not a gauge, It is a hand held unit that also works as an OBD-II scanner, We got ours as it had obd and could hook up to the dyno and display realtime, The innovate is a package in one, The techedge on the other hand only has a 3rd party system on the PC or you can buy optional gauge, we set it up with TEWBLOG but now run it with nissan consult.