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1: Plug the Ford adapter into the existing Ford harness
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2: Run the city and turn signal indicator light wires behind the frame and in front of the radiator. Let them dangle over the bumper for connecting to the turn signals
3: Connect the VW harness to the back of the new light
4: Test the lights (low and high beams). The high and low beams should stay on if the multifunction switch is held. When it is released at this point the the low beams will turn off, and the high will remain on.
5: Install the lights by adding 3 bolts back in (the plastic one in the lower inside is no longer needed)
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6: Splice into the existing harness wires by removing the tape around the wire guard, pulling it down, and carefully using a wire stripper to cut through the outer wire about one inch down the wires and again about three quarters of an inch further down. Carefully cut the ring open with a utility knife. Be very careful not to cut the wires unless you never want to use the original turn signals again. Cut the wires from your custom harness to length and add an extra inch or so just in case. Solder the appropriate lead to the wire with the wire leading up towards the adapter as shown below. Cover the exposed wires with electrical tape as there is not much room for shrink coverings.
Splice wire 3 from the VW adapter to MAJOR (blue wire), and 4 from the VW adapter to MINOR (orange-green wire) (Thanks to freakfocus and Ed_Cloud9 for that info since I didn't keep track of this part)
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7: After both wires are spliced, put the wires into the original guard and wrap the end with electrical tape.
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8: Take the wiring harness and slip it under the lip between the top and bottom just under the frame where the wire comes out. Feel around for it and you'll know what I'm talking about. It feels like it was designed to hold these wires in place.