I know two would be better. The idea is to get a general sense of how many amps are flowing. I can turn things on and write down what they use.
The twin hots if they are ever hooked up, my slip has only one small plug
, will be different phases, how does that affect it?
I watched a video where if you take a clamp ammeter and put it around the entire cable, it will zero out the reading unless some of the current leaks
out and takes another path back to its source. Which is one way of telling if your leaking current into the water
I thought about a switch to select another shore line.
But where would you get another sense ring coil, wind
your own? Find one out of a solenoid? The gauge also has some possibilities like leakage current detection, so more sense rings and switches needed, gets rather complex.
Anyway what your saying is perhaps each wire could have its own sense ring and then connect all of them to the gauge to read all or a switch to read separately. I see no point in having multiple gauges cluttering up the space.
If they were all connected at once to the display gauge, would they be wired parallel or in series?