Ok Im 100% sure you must have a commander to suit the GTR PFC Full Stop
This is easier , and quicker ,....off Nenguns Site
Please note that there is an old type version Apexi Power fc for Nissan vehicles.
If you have this versoin the Hand Commander 415-X001 will not suit this model.
The H/C for the older version is 415-N001.
415-N001 Hand Commander Old version PFC Skyline - R33 GTS-t S2 - ECR33
Skyline - R33 GTS-t S1 - ECR33
Skyline - R33 GTR - BCNR33
Silvia - S14 S1
Silvia - S14 S2
Skyline - R34 GTT - ER34
415-X001 Hand Commander Skyline - R33 GTS-t S2 - ECR33
Skyline - R33 GTS-t S1 - ECR33
Skyline - R32 GTR - BNR32
Skyline - R33 GTR - BCNR33
Skyline - R34 GTR - BNR34
APEXi - Power FC - Hand Commander - Nengun Performance