Important boating maintenance part! This is a direct replacement oil tank switch sensor for many Mercury Optimax outboard motors from 2005-2014. It replaces OEM part numbers 87-856156T04 and 87-856156A4. This 12V, single-pole (1-way) ON/OFF switch monitors the oil level in your remote oil tank. When the oil gets low, it should trigger a warning on your dashboard. If your low-oil warning light is acting up or not working, this sensor might be the culprit. Before ordering, double-check your engine's model year, serial number, and horsepower to ensure compatibility – when in doubt, send the seller a message with your details. Installing a new sensor helps ensure you never run low on oil, which is critical for protecting your expensive outboard motor. Comes with a 1-year warranty for peace of mind.
