...the level of technical capability in all these works is so impressive...as an electrical engineer, I'm so humbled that I used only "Paint" to make the Mangusta drawing. But wrt to the relay near the indicator stalk, at least Euro cars (and maybe all 4 headlight cars) had a relay that would allow flashing without needing the headlight power. https://pantera.infopop.cc/top...gusta-wiring-diagram see breakout on the headlights.
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