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How I do that without a manual buton? I want the start to be done automaticaly ?
Without a button or power supply, I don't think you'll get a result. If you plan to use in your car, then you might find which wire will power on when you turn the key. If you want that to short the pins, it may need a small circuit to give one second pulse to the power pins. So preferable to use the same wire to power the TB.
Light blue words might be a link. Have you try to click on them? Big Grin
Hi! finaly I've done some breadboard prototyping with a 555 timer chip

I found this shema on the net

Instead of a LED I give power to a 2 circuits relay for 15 secondes. My circuit got 12v on the 555 with a 100uf 25v capacitor + 3 X 470k resitors

Sorry I can't link the video, I don't have enough post  Angel
You should consider the factor that the voltage may drop substantially during the engine start up.
In such condition I'd suggest to keep the timer threshold a bit higher, let say over 10 V. Which means that the timer should start from low to high when it reaches 10 Volts. I don't have the proper idea at the moment, but I consider to avoid several TB start ups, when starting the engine.
Light blue words might be a link. Have you try to click on them? Big Grin
Yes I have to put things to the puzzle

-I'll put 5v regulators for screen and accessories on the board
-For the engine start I was thinking to put a capacitor to get more stable voltage

But for me it will be useless I got an electric car

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