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The emergency warning flasher system is a separate plug-n-play setup that plugs into your existing wiring harness, assuming that's intact. Do you have working turn signals? You can work on turn signals as a task unto itself and then add the emergency flasher circuit.
Here's one of the vendors that has your part number in stock and you can buy it online. NOS Parts Ltd. Tell them Chad in Seattle sent you. Lol.
C5TZ-15B590-C - 65/66 F100/250 (except 4/W/D) Before Serial 858,001.