Dash light and fuel indicator

[Jimmy]

today I tried to repair the things. The fuel indicator is working, it was bad ground. the dash light is not working, when im removing the switch, connecting a wire from Batterie + to the green cable and connect the bulbs to ground they work. I build it all together like it was, now my taillight is dark, the side marker lights are dark, didn´t noticed that bevore. could be the light switch damaged? Can i test it?
the wireplan I have confuses me, which of the light switch cables is +?
I want to connect the lights with a "wire bridge" so i can drive, because i have no chance to get the switch in germany.