Thumb throttle with voltmeter

4 wires: the yellow wire is connected to positive power.

5 wires: blue wire is connected with power output wire, yellow wire connected with positive power.

6 wires: the yellow wire connected with positive power, the blue wire and the white wire is the function wire.

7 wires: yellow connected with positive power, blue is shared wire, center gear for 3 gears, white is high gear, brown is low gear.