How do I make a 12v switch/relay for my cars' rear turn lights....?

that will connect to the rear left and rear right turn signal lights (hot wires), and keep a LED light from turning ON until BOTH turn signal lights go ON (for 4 way emergency flash). (If the left turn signal goes on my LED stays off. If the right turn signal goes on my LED must stay off. But if BOTH right and... show more that will connect to the rear left and rear right turn signal lights (hot wires), and keep a LED light from turning ON until BOTH turn signal lights go ON (for 4 way emergency flash).

(If the left turn signal goes on my LED stays off. If the right turn signal goes on my LED must stay off. But if BOTH right and left lights go on the LED light must go ON.)
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