I don't have an exact wiring diagram for your car (I do have a 74 electrical manual), but the Euro plug wiring I sent should be accurate.
The reason you have only one pin on the 4-position connector is that the Euro front headlight setup probably had ONLY a 1-filament bulb, for the turn signal itself. In order to do both turn AND marker (like you would see on a US bumpered turn signal), you would need to jumper over the taillight power, and install another pin (and maybe another for a ground). Those pins are available at the dealer. Soldering is involved in installing the wire into the pins.
I didn't bother with any of the colors, etc when I did mine, I just buzzed it out with a voltmeter and powered the Euro headlight with a 12 volt power supply and connected things up until it worked to my liking.
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