I never bothered to fit the motor cut off sensors/brake sensors nor the gear change sensor as there’s no need for them if you have a bit of cycling sense, they’re prob more useful for a total cycling novice.
All parts were bought from Darren @ Brighton bikes and the brakes are formula r1 hydraulic, some folk may say go for the Bafang hd kit but the bbs01 kit is more than enough speed and power/torque for road/off road, the lekkie front ring is a 42 tooth driving a 11 to 40 rear cassette, I’ve set my upper motor speed on throttle to 18mph and upper motor speed when peddling to 24mph.