Check fitment before purchasing. Works on some Mercury Outboards - 4, 20, 35, 40, 45, 50, 70, 150, 175 & 200. Mercruiser Sterndrive Engines - 5.7L 350 CID V8, 5.0L 305 CID V8, 7.4L 454 CID V8, 7.9L 482 CID V8, 8.2L 502 CID V8, 9.4L 572 CID V8, 8.8L 540 CID V8 & 6.2L 377 CID V8.