Ohh okay, I understand better now, thank you very much!

I believe he was asking, do you actually need an analog reading to precisely measure the voltage? Or are you simply looking for ON / OFF, i.e. a digital reading?
If you only need a digital reading, you can use any GPIO pin. Approx 0-0.8V is logic low, 2.4-3.3V is logic high. So if your turn signal ...

I need analogue reading to know if the brake or turn signal is active (voltage drop)

Edit:
The system looks like this:

Hello all,
I’m currently working on a project based on an ESP32 Devkitc-v4
The ESP32:
• Acts as a BLE server
• Measures the voltage of my Left/Right turn signal and my brake light (of my motorcycle)
• Controls neopixel LED bands
• Retrieves measurements from a BME280

My concern is about the ...