you need to find the airsoft firing warning L.E.D that is linked into the BB motor
try this link for wiring the cannon L.E.D to the main board using the "k" button but it wont fire the cannon recoil on the T34 just noise ,flash and track recoil heres the link http://www.dougstigerparts.com/led_cannon_flash.htm
going to investigate further how to do it using the BB motor up stick only as i did sort it on my tiger gun upgrade (forgot to take a photo ME BAD) and it works a treat