If I understand correctly, basically I should start with a low number of turns, and if does not work gradually increase until you get a correct measurement.
What could I use to play the part of the coil insulation?
However, soon as I can do you have pictures of the connections I made.
I am wondering if were able to finish the sensor? I need to do the same thing and am wondering if the addition of the low number turn transformer with good ground solved the problem.