Hello everyone, I am working on a small project consisting in recovering as much as possible the data of my car which is still old for its age (Peugeot 305 year 1985), so I am looking for a way to combine my project with the existing system in the car . My problem is that I am trying to recover the data coming from the fuel gauge, which during my tests was powered by the VCC 5volt of my arduino, but currently wanting combined with the original circuit, I face a voltage of 12v at the level of the gauge, so I ask a little help from you to move forward, I think of using a transistor but concretely I am afraid of burning my arduino, thank you