On my 1986 outbd & 1990 inbd both have a flat area about 16-18" fwd of the transom in the bottom bilge area. Some boat dealers installed the bilge pump in this area because it is flat. This area is suppose to have been made with no wood or air bubbles so a transducer could be installed. Check yours.
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Tis better to be quiet and thought a fool than open your mouth and prove it!!
1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson 
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