As mentioned before, these do not come with a brake light switch, also, the brake light switch is generic and does not come with a connector for plugging into the bike. I hate hacking wiring! Even more than discovering hacked wiring!
The connector.
The seller, a whole £1.54 so no excuses.
https://www.ebay.co.uk/itm/1-2-3-4-5...r=550859030843
The brake light switch.
The seller.
https://www.ebay.co.uk/itm/Single-RearSet-Hydraulic-Brake-Pressure-Light-Switch-Cable-Banjo-bolt-M10x1mm-UK/232786319647?epid=2055214799&hash=item363325591f:g:iF0AAOSwj0RbDW-k:rk:1f:0