Acceptable voltage at AIN of PMU16

Hello, please what is maximum safe voltage which can be connected into analog input of PMU16. (if I do not need to measure the range over 5volts) . Is it acceptabe to connect 12-14volts from vehicle network? Or the voltage divider need to be used?

We recently added a comprehensive pinout document for PMU.
It is available on the website and describes all the hardware details.

You can safely connect the car supply voltage to the analog input.
It might have a small effect on values read by other inputs.
Check if that reading change is something you are concerned with, depending on the things you measure.