For the Mercury oil injection topic, there's really only two ways to go. (one) Buy an electronic oil injection unit. or (two) use premix. Now I know that most people here use and recommend premix, mostly because it's cheap and it does the job. But I have one of those oil injection units and since I use my boat less than a lot of people here I'm very happy with it. I can expect the unit to last somewhere between 600 to 1200 hours of run time, and since I only put on about 50 hours a year that's a long, long time that I don't have to fuss with adding oil, figuring out ratios, remembering if I put in oil, etc, etc, etc. So the choice is yours. In all cases DO NOT just use that gravity fed tank at the top of your engine. If you do, at some point in the near future we'll all be reading your post asking where can you buy a new engine.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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