Green/red should be grounded. In your setup, the solenoid should be connected to a black wire and a yellow/red wire. The yellow/red is what travels through the harness to the start button. Pressing the start button then grounds the solenoid through the green/red wire, activating it.
The brown/white wire is for the gauges and should also connect (though the harness?) to the ignition switch.
Black/red should carry power to the dimmer switch on the left control.
The brown/white wire is for the gauges and should also connect (though the harness?) to the ignition switch.
Black/red should carry power to the dimmer switch on the left control.