Here is a quick write up on how to wire a kahtec module to your rear fog light and can also apply to the top center brake light.
I installed the
Evo R rear fog light using this DIY
DIY: EVO-R Foglight Install
and had it set to the pulsing mode but ultimately did not want it to keep blinking continuously. I came across Kahtec who make different modules to make a 3rd brake light flash and then stay solid.
Here is a listing of Kahtec's products:
Products
I went with the Blinking Smart Stop Delay Version (Item #: 301-2003-11) and wired it up according to the following diagram I made.
I'm not 100% sure that the colors from the tail light harness are green and black but its the colors I used on my extentions. I will double check
All you need to wire it up is a soldering iron, solder, wire strippers and shrink tubing. The actual module I then tie wrapped to the top of the crash bar which should be safe from water.
Here is the completed setup.