Not too difficult to install.
On the KTM 690 duke you need to do the following for access to install:
- Remove rear seat
- Remove front seat
- Remove right fuel tank cover
- Remove right lower cover
The just follow the wires from the O2 sensors to find the connector, there is only one it will fit, so its easy to find. I left the O2 sensor in the header and just zip tied the wires out of the way. This way I can re-connect it for "on road use".
Will probably take about 15-30 mins. start to finish.