I installed these on my '92 245 (ambr lights on white car) and it's juust one more thing that visually separates the enthusiast car from the rest of the pack.

I'm too lazy to dig thru wiring manuals, but I just looked to see how they are wired. They are spliced into the white and blue turn signal/parking light wires on the passenger side, and the white and green wires on the driver's side. This way they come on with the parking lights and will flash with the turn signals (although out of sync - side marker flashes on when turn signal flashes off). I think that's the effect you're looking for. Wiring these on a 240 is easy... just use a stiff wire to push the wires down into the 'black hole' on the aft side of the wheel arch under the hood.