Last month, we reported that Tesla had purchased $2 million worth of lidar sensors from Luminar, a surprising deal given Tesla CEO Elon Musk’s very public disparagements of autonomous vehicle companies that partly rely on the laser sensor. This week, a reader sent us this photo of a Tesla Model Y with Luminar’s Hydra sensors mounted on the roof. The back of the vehicle says “Engineering Vehicle,” which could mean the company is using lidar to validate its self-driving software (although Musk has claimed that wasn’t necessary “anymore”).