Can anyone tell me what the different harnesses are used for in the Lenco trim tab switch assembly? I have an older (I think) switch assembly and the switch in my console does not have the black cylindrical piece on the back side of the switch panel. My actual switch is the shown in the bottom image. Mine only has the black 10 pin connection (third harness from the left in the top image and only harness in the third image). Are all harnesses necessary? I am trying to replace the switch on my console but would rather not have to run new wires and splice in harnesses that I don't have.