How to wire key switch/ignition + throttle and voltmeter for Ebike 2022 step by step in description

This video is how I sorted the problem of not having a switch wire after hours of searching the internet I am using g-volt 48v 1000w conversion kit with sw900 display

Step one: find wire C (the wire for the display)

Step two: cut the red power cable in middle between control and connect be careful not to damage any other cables

Step three: connect yellow wire from throttle to red wire from controller

Step four: connect blue wire to the red wire going to connector

Step five: connect all parts as instructions state and enjoy!

[Evill-jhyz]

Which blue wire to which red wire? The blue wire from the throttle to the same red wire from the controller that the yellow is attached to?

[akBeuy]

I removed red wire and now display doesn’t work, when I try to put it back?

[electricscooterrider-fc]

One question please should i cut the cable in the controller side or display side or doesn't make any difference