Long three cables connection: can I use an audio stereo cable?
You can probably use a stereo cable. Make sure you use the external shielding for ground, the analog signal as oe of the shielded lines, and power for the other line. You probably need to add some decoupling capacitor close to your sensor. If the output impedance of your sensor is high and/or the analog value fluctuates quickly the cable will act as a low-pass filter. You did not provide enough information to guess whether this could be a problem.