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Hi! Sorry for the wait, I had a busy day. There should be 2 parts of aluminum with a stripped wire in between. And then for each sensor you need a ground and a send so 4 on each side yes! I put them in between plastic wraps to isolate them. The wire from the ground and the send should not be in contact only through the aluminum foil, which is not really clear from my drawing I guess. Does this help? If you have more questions feel free to ask :)
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