So I've been trying to solve this myself for the past 2 days with no luck. Followed Rudi's tutorial to wire and setup everything, minus the killswitch.
Here's a link to the pastebin: https://pastebin.com/zHuSnGth
Additional details:
GIMX adapter: Teensy 2++, loaded with EMUG29PS4 at90usb1286
PS4
Logitech G27
Wiring:http://imgur.com/a/DQPhO
Didn't have 2.2k and 3.3k resistors, using 220 and 330 as Rudi states:
Connected:The above resistor combination is just a suggestion. In fact u can use any combination of resitors as long as their values divides as about 3:2
Teensy ------> PS4
G27 --------> Pi
DS4 --------> Pi
Wi-fi dongle ------> Pi
PS4 boots up, Pi and teensy power on, DS4 flashes yellow once, G27 Calibrates wheel, Then nothing :/