I am trying to work out where to take the neutral light from for the relay to allow the electric reverse to be used. The engine is a GSXR K1.

The gear position sensor has three cables from it, blue, pink and black/white. Do I need to be taking a feed near the plug on the loom or should I take a feed a bit nearer to the clocks. Looking at the wiring diagram it is a blue/black going into the clocks that powers the neutral LED.

Cheers!

On my R1 I took the relay feed from the neutral lamp and not the switch for this reason - it was easier to just look for the lamp wire

Not that I have a lot of bike experience but have fitted a few car gear position sensors on sequential boxes. Usually they are pos and neg across a resistor with the third wire being a wiper which gives the signal ( whether that be reistance or voltage ).
As said prob better to look for it at the light.

On the zx9, and I would think a lot of bike engines?, the neutral switch is an earth switch,
so link the earth from the relay to the wire to the switch.

On the GSXR, the Blue (BL) wire is connected to the Black/White (B/W) wire when the gear sensor is in the neutral position.

The Blue/Black (BL/B) wire at the speedo harness connector is your neutral light wire.