I'm guessing that since you want to use the boost controller function you are running the MSnS code for the processor. The boost controller function looks to be experimental at the moment, but a diagram of the circuit needed to connect it is on
http://megasquirt.sourceforge.net/extra/boost.html.
It looks like you got a reply on your fan control question (
http://www.msefi.com/viewtopic.php?p...control#119764.
If I get to the point of putting the turbos on my Camaro and changing the fan to be operated from MS instead of the sensor in the manifold I'll try to remember to post up what I did...