Its very easy, all you need to find are the wires that power your turn signals, pinch them, and the blinkers will work each time you turn on your turn signal. I wanted to do this to my 300E,but the door would require too much modifcation in order for the mirror to fit.
1987 mercedes 300E
1995 e320 conversion(hated the 300e grill)
Monochromatic Paint (Custom Blue)
Flat Badged (front)
custom "carbon fiber" console
18 inch HP EVO rims
Sold! Now I drive a Monte Carlo SS