Leaderboard

Your boss looks the same as my momo one. The black wire with the female came with the boss and I made the blue wire to plug into the connections on my horn and boss metal disc as you have. As you can see the steering wheel it is for is also a momo. If you only have one terminal/wire coming out of each horn button they must be earthed through the horn buttons already to the steering wheel and you just need to plug those wires into your female black wire to give it it’s positive feed. test it with a battery and a couple of wires the wires coming from the steering wheel to positive through a test bulb/light and a negative wiring touching the steering wheel itself. Push the button and the test light should light up. My brass disk is also pushed in similar to yours