Sure Rafael, you only have to read the Trex SA manual, everything is there, except the gyro adjustments which can be found here:
http://www.raptortechnique.com/gy401-jr8103.htm
Obviously, you have to change some settings to make it work with the Trex.
The only deviation from the manual was with the pitch numbers to acquire the desired -2 to 10.5o window pitch in normal set-up.