Check fitment before purchasing. Works on some:
Mercruiser Gas Engines - 5.7L 350CID, 8.1L 496CID & 8.2L 502CID.
Mercury SportJet - 90, 175, 200, 210, 240 & 250.
Mercury Outboards - 8, 9.9, 13.5, 15, 25, 30, 40, 50, 60, 65, 75, 80, 90, 100 & 115.
Force Outboards - 90 & 120.