Another one I forgot to mention is the Aeroforce gauge.
Aeroforce Technology Inc | Welcome
They look like very good gauges as well. They can monitor even more parameters.
Theres a list of parameters that Killerbee(thanks for letting all know) posted
Pods and Gauges help pls!
As for the Scout; from my understanding, theres the EGT probe that you hook up and then 2 or 3 others(if i remember correctly) that you hook up to your wiring harness.
The biggest one that you want to monitor if your going to do any pulling I think is the EGT, there maybe others to that are just as important.
As for your other questions, I'm not as knowledgeable so others will have to chime in.
hope this helps you out in some way,
yellowchevy