I know there's a diagram out there...
But if memory serves me, lift the tank and on the left side you will see a 3-conductor connector, Pink, Blue, Black wires. One side goes to the GPS (Gear Position Sensor), the other back to the ECU.
Separate the connector and using a T-pin or something similar, remove the pins for the Pink and Black wires going to the ECU. Install the resistor to these connections (I used crimp connectors on the resistor and plugged the wires into them; easy to go back) and tape and/or heat-shrink the connections. Make sure you re-connect the original plug.
One of these days, I'll spend an evening and make it switchable.
HTH...