I've installed a few of these on bikes, my wife's SUV and my truck's high mount brake light -
https://www.superbrightleds.com/more...odule/195/845/
-and have loved them. $5 each and all are still working. Haven't done my wing yet but it's coming.

They mention LED, but will work with regular incandescent bulbs.
With incandescent bulbs you get a tiny flutter, then 4 on/off's then a steady on. Works fine.
With LED's, you get 4 extremely fast and attention-getting flashes, then 4 on/offs then a steady on. REALLY works well.
I can assure you, people do notice it and I haven't been gigged for it.

Wiring is easy - a power in, a ground, a power out. Just install it inline and you're done.