Now for the installation into my Legacy.
Installation is very easy, there are only 4 wired to hook up: power, ground, tach, and knock signal. We just tapped the signals at the stock ECU to keep wire routing to a minimum. I will put up the pinout for anyone who wants to install this as soon as I have a chance to make it all pretty.
As I said above the electronics inside will convert a coilpack signal into a a tach signal, so on our cars all you do is pick up one of the 4 coil pack signals off the ECU and you are set.
If you want you can install a separate knock sensor, but most people will want to just use the factory one, since it is optimally placed on the motor.
Hope that helps,