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It is a speedometer pick up tube.no longer used due to clogging.
You will probably have to drop the lower end of the outboard. Its sound hard but really it is usually quite simple. The pump is nothing more than rubber impeller on a brass collet.
If the horsepower of your Mercury outboard lower unit is 75 and below, SAE 80W90 Gear Lube is recommended.
How do I remove the lower unit from my 1984 50 hp. Mercury outboard motor?
The 1973 model, 7.5 hp Mercury outboard, requires 6.8 oz. of gear oil.
Never mind I figured it out
The lower cowl on a vintage 1973 Mercury 9.8HP outboard motor with 4 retaining bolts. They are passed through the cowl and directly into the body of the boat.
No
Take it to a marine repair shop or google it up, the answer is there
Mercury® Marine High-Performance Gear Lube from Basspro
The size of the engine is not mentioned, but most Mercury outboard models situate the drain plug on the lower half of the port side cowling. Have your funnel and or drain pan ready when you remove that plug! Also be careful not to drop the sealing washer off of the plug, fwiw, the manufacturers recommend replacement of this washer.
To fill your Mercury Outboard Trim boat motor, lower your engine to a 45 degree angle, Make sure your boat is level. Remove fill screw, and add the amount of fluid required to fill.