Accessory wiring - which circuit ?

While I have the frontend off, I thought to pickup this gadget to install a voltmeter and usb socket on my 99 5th gen: https://motomods3dsolutions.com/products/1998-2001-vfr800-charging-bracket

So next question is which circuit should I tap into to power the accessories ?
Ideally I would like a circuit off the engine start/stop switch. I don't need high current (maybe 2A max) so I'm thinking skip wiring a separate relay from the battery.

There used to be someone on the forum who sold an accessory wiring harness but that option appears gone now.

 

Thanks,
cycleterminal.com also has some good fuse/relay harness kits.
I still need to tap into an existing switched circuit to close the relay. I was thinking maybe piggyback on the low beam relay wire.