My original worked fine with incandescent bulb. Once I installed the Plasma LED taillight bulbs, I would (almost) get 1 "click / flash" then the dash indicators were steady. Externally, the lights, including LED front turn signals, worked as they were supposed to. But it was irritating having the steady light on the dash.
Got this installed...Works PERFECT. It does take a bit of physical maneuvering to get access to the relay, but 15 minutes later...It was worth it!