Emergency 4 way flasher

I would like to add a 4 way flasher to my '04 sw. Has anyone tried this and have any suggestions or answers?
Thank you all.

Here's one that may work..............
being that the mod is being done on another Honda, the wire colors may be the same.

http://www.rattlebars.com/mtz/fourways.html

You can purchase a BACKOFF XP Module from Two Wheel Touring. It will provide a safety flasher feature for your break lights and comes with a optional connection to install a switch for an emergency flasher. Their website is:
http://www.twtouring.com/safetylighting.htm
For $20 more you can get the BACKOFF Brake Hold Module which will keep your grake lights on while you are decelerating
Let me know if this helps?
>> Dennis

Thank you for the ideas on adding 4 ways to my swing. I think I will go with Dennis' suggestion. It really looks good on the rear lights.
Thank you