Not Ranked
The easiest way is to use the second toggle to connect the left and right terminals on the original 3-post switch. All 4 lights will flash when the signal toggle is in either left or right positions and the second toggle is on.
However - that may or may not be legal in California.
The official emergency flasher switches that I've seen lately also flash the dash lights. Frankly, it might be safer to bite the bullet and buy a real aftermarket unit.
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