It may help some of you to know that I have successfully wired auxiliary lights to a new (2020) Tiger 900 Rally Pro.
It is my understanding that the Tigers only use CANBUS to communicate between the ECU and the dash / engine sensors. All other wiring such as lights, horn etc is traditionally wired.
I have wired a pair of Denali S4's and used the Denali wiring kit. I have wired them to come on at 50% power with the ignition (regardless of main beam or DRL's) and switch to 100% with high beam or high beam flash. The Denali wiring kit basically provides nice neat cables and waterproof connections with a fuse and relay built in, but you could achieve the same results using a standard relay and fuse with any make of lights.
I used Denali's switch eliminator plug and used the included posi-tap connector to tap into the ignition wire going to the auxiliary din socket (under passenger seat) to provide an ignition feed.
I also used the Denali dual intensity controller which is basically a dual relay allowing the ignition feed above to switch on at 50% and a secondary input to switch up to 100%.
The main beam (100%) signal is easily accessed either on the multi-pin plug going into the back of the headlight unit (you'll need to peel back the rubber boot) or at the other end on one of the three multi-pin plugs under the passenger seat. It’s the plug on the left side nearest the aux din socket. On my 2020 Rally Pro the plug is a light cream colour (the other two are black) and the wire is blue with a white stripe and carries 12V when main beam is on. It is important not to drive the auxiliary lights straight from this but rather use this to switch a relay. I used another posi-tap connector to connect into this wire under the seat and I was able to conceal the relay and excess cable under the seat.
I hope that this information is of use to some of you trying to hook up additional lighting without any additional switches.
This photo shows the plug removed from the back of the headlamp / DRL unit - the blue wire with white stripe provides a 12V signal when high beam is active.

This photo shows the plug under the pillion seat which carries the same wire to the headlamp unit (you can just see my posi-tap below the plug)

This photo shows the above plug removed and the posi-tap connector tapping into the high beam wire (blue with white stripe)
