So in my normal fashion one thing leads to another. I originaly ordered an innovate DB gauge and LC-2 controler. Once I had that in hand I realized the data logging with it was pointless since you didn't have RPM as a reference point. So I also ordered the LMA-3 AuxBox which has the ability to log;
RPM,
3 bar MAP/ Boost,
Injector duty cycle,
EGT/CHT,
2 axis accelerometer,
TPS

My question is out of all of these options what do I really need to log and tune when I install the SDS?
How big a role does EGT play a role in tuning?