The following steps outline the installation procedure for plug-in ECUs to suit Nissan GTS-GTR, R34 GTS, Silvia S13-S14, Silvia S14-S15, and 300ZX:

1.Remove the factory ECU from the vehicle: Ensure the key is in the OFF position. The factory ECU is located on the left side A pillar. Remove the left kick panel. Unplug the wiring harness from the factory ECU (use a 10mm socket to unwind the connector while gently pulling on it). Remove the 6mm bolts (10mm socket) that retain the ECU and remove the ECU from the vehicle. DO NOT touch the exposed pins in the factory ECU connector.

2.Remove the factory ECUs circuit board from its enclosure: Ensure you are following the given anti-static guidelines and ARE WEARING A CONDUCTIVE WRIST STRAP connected to a conductive working surface. Remove the top and bottom covers from the ECU enclosure by removing the four corner retaining screws. Remove the circuit board by removing the retaining screws. Hold it only by the plastic header and place it aside.

3.Fit the G4X Plug-In ECU: Remove the ECU from its packaging and place it immediately in the factory enclosure. Place the factory ECU in the packaging your Link ECU came in for its protection. It may be necessary to remove the screws that retain the blue header.

4.Thread the USB tuning cable through the slot in the back of the case and plug it into the ECU. You may need to unplug it from the ECUs top board to do this. If using the internal MAP sensor (recommended for all applications requiring less than 3.0 bar of boost) run a length of vacuum hose into the enclosure and connect it to the MAP sensors pressure port. It is recommended to use a hose clamp or small cable tie on this hose.

5.Reassemble the enclosure and fit the ECU back to the vehicle.

6.Connect the ECU to the factory wiring loom. Carefully tighten the header bolt while pressing the sides of the connector into the ECU. It is a common fault for this connector to bend in the middle and make poor connection.

7.Do NOT attempt to start the vehicle. Proceed to read through the remaining sections of this manual first.