If you go with an evinrude it has a different bolt pattern than force on your transom. also it will cost on average $500 for new controls/guages You can't use your old stuff as it won't match. I spent $5800 total to replace an 150 evinrude with a used 150 yamaha a few years ago. worked out great for me. I know a good dealer in the Detroit area if you want to come this far that deals strickly in evinrudes. But I think you'd be better off with a used Merc as the swap will be easier. I doubt your trade in is worth anything.