I think you do in WA but not sure . I am in AZ and I put the EZ kit on mine because I like to have turn signals and emergency flashers . I drive on the roads a little and I feel much safer having them .
Where are you having it "certified" as street legal. I would talk to them first. My Dealer had a check list that they sign and you take that to the DMV. I added a horn, brake/turn signals and tail lights. I used Leds