I would like to wire up the city light bulbs in my euro lights to act as daytime running lights. I would like them to be on when the ignition is on but the headlights are off. When the headlights are turned on I would like them to turn off. Is there any way I can easily do this with out using two relays?

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine