Hi,
Converting to Euro lighting is pretty easy. I did it myself for under $4 in materials. The Sidemarker flashes in unison with the Turn Signal Indicator with the Lights Off and in opposition when the Lights are On.
I did this several years ago to my Esprit and using the Boxster schematics, figured how to get the same effect from the Boxster. Took about 30 min. - Works great!
After all my Trial and Tribulation, I found this hack:
http://wa4ekg.home.att.net/996mods/sidemarkermod.html which is exactly how I did mine - great minds do sometimes think alike
Hope this helps...
Happy Motoring!... Jim'99