Dip Switch
My 72 model's indicator switch gave trouble and I never liked the earlier dip switch operation, or the wiper speed on the gearshift console, so I replaced then with a pair from a 76 E3 parts car . I'm pretty sure the part numbers for the 73 onwards coupe are the same as for the E3.
It took a couple of days to work the wiring and do the job, however now the operation of headlight dim/indicator/wiper is the same as other more recent European cars, and the switches feel more robust than the older coupe ones.