Voltage Range of Analog Inputs

[Eugene]

Forgive me if I'm blind, but the only reference to the electronics in the 3rd update that I saw was about the fuses, please correct me if I'm wrong.

The reason I'm asking this is because I wanted to build a custom circuit board that would monitor the current, and using the analog inputs on the controller input the data.

Problems with this idea:
1. Is it legal to have the circuit board connected in a serial circuit to the motors, or the main braker? The current has to be measured in a serial circuit, right?

2. Which transitors would have the correct rating to take the currents that might go as high as couple hundred AMPs?

3. What is the maximum current that can go through an analog input on the controller?

And here is a unrelated question, do i need to have a power source when i connect a potentiometer (it is just a resitor right)?

Thank you all for helping us out!!!
We don't have any proffesionals on outr team.

Eugene