FIRST: Unplug your printer from the AC line voltage. Risk of electric shock!

Remove the cover(s) to access the Duet controller.

Plug one end of the KK wire harness into the E0 (and E1 if installing both) end stop switch header(s) of the Duet controller.

Route the wire harness to the extruder.

Re-install protective covers so no AC line voltage is exposed so the printer is safe for operation.