You need an electronic flasher. The old type with the mechanical "points" won't work correctly with the LED blinker bulbs. I think most replacement flashers are electronic now. I bought my car 12 years ago and someone had already put one in it. You didn't ask, but get the bulbs with at least 200 lumen brightness. The cheaper ones just don't cut it. SuperBrightLEDs sells some good quality bulbs.