I got 2 wire harnesses for the waco, 1 with servo connector and one without. Do I need to use both? And is there a diagram that shows the hook up?

I got 2 wire harnesses for the waco, 1 with servo connector and one without. Do I need to use both? And is there a diagram that shows the hook up?
i'm trying a couple of ones off amazon, haven't got them yet. I'll post when I do.

