Cory's Knot

I was working in replacing the gas gauge in the beetle yesterday when I ran into this knot of wires. Most of it is electrical, but some of it serves other purposes - the two thick black tubes carry air, and the thick black cable that runs from bottom-center into the silver disk at top-left is the speedometer cable. When I took this picture I was most interested in the little silver blob on the left that is missing a cable - that plugs into the back of the gas gauge itself, which at the time was sitting on my workbench. It turns out I needed to order a replacement for that silver blob.