As a follow-up to my last post, to meet local laws (Texas) I also had to add a lighted license plate frame. I bought the Radiantz frame with 6 LEDs (like this one: http://www.bikerhiway.com/radiantz-illu ... nQodBBwAzQ
) at a cost of ~$27.
First I had to notch the license plate around where the frame's wiring comes out before I could screw everything together. I then connected the wiring - which is just a bare-ended black wire and white wire - to an empty 2-pin connector under the seat. Note that on the bike's wiring, blue is the ground and yellow is hot. On the frame's wiring, black is ground and white is hot.
I noticed that earlier in this thread a matching 2-pin plug was bought to connect to the frame's wiring and then plugged in. I found it easier and cheaper just to use a quick-splice connector like this one (at a cost of 20 cents each and widely available): http://www.amazon.com/Solderless-Wire-Q ... pd_cp_hi_0
I connected blue to black and then white to yellow, and now I'm street legal again.
When done, this is what the completed wiring looks like.