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Checked the T120 wiring diagram in my Haynes Manual and it shows a feed from the instrument cluster to the common connections to the handlebar indicator switch and hazard warning switch. No real detail or explanation in the manual, but I suspect that the system is either driven from the main mangement unit or perhaps from circuitry within the instrument cluster itself. Certainly no old style clicking flasher relay as of old. If an image of the circuit diagram is useful to you, let me know.