Revcounter & yellow wire (400 carb)

I have 2 yellow wires left at the coils. When I turn the ignition key, it is has 12V. Also my revcounter does not work. So, which color wires do I need to get the rev counter going? Cannot be the yellow ones. Normally one has to put a wire on the negative point of the coil(s), not the positive, but than I have the 12V-yellows left. My diagramm does not show the right color codes.

Please help! Can anyone with a carbed 400 check the situation on their own car?
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I forgot to tell that I can not find a green of brown tach-wire. If this the right color on the 400?

 

Never mind... I found the rev counter wire was completely missing! The previous owner had the car rewired obviously, but I think they must have used a wiring diagram from a 365 GT4 2+2 or C4 with the mechanical rev counter.

Anyway, yellow and red are at the 12V station of the coil and the new wire from the coil to the dash was a 5 minute job.