I am lazy and really didn't want to bother with the hassle of premix. I like the ease of just pumping reg gas into my tank and then having the engine do it's own mixing. But, like everyone else with an older Merc, I was afraid of that plastic gear that drives the oil pump breaking and me suddenly being miles offshore with a busted engine. My solution was to purchase and install an electronic oil injection system from Marine Solutions, Inc.
http://www.marinesolutionswi.com
The actual installation took me just over an hour. The unit comes with instructions and everything necessary to do the changeover, even including a new set of spark plugs. (NGK BUZ8H) The system works like a dream and I could not be happier. No more worrying about no oil in the engine, and no more wondering if I put the right amount of oil into the gas tank. You might want to consider this also instead of disabling your oil injection system. Just my .02 cents 
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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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