Electric problems

I have problems with electronics in my 71 Plymouth Fury III. The turn signal indicators are shines continuously. The fuel gauge doesn't work.
Today I also took the dashboard apart. I noticed a cable that made me suspicious. The Fury was once retrofitted with hidden lights. But these were then dismantled again.
The Fury is currently with the original front and lighting.

Do you need different wiring for the hidden lights?

I found this cable.

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Author: BE_Fury