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I would be hesitant to hack into the harness as they are not cheap. Have you tried E-Bay? A nice tach is $100+ so $250 is not bad(compared to Yamaha) I have not had great luck with tachs on 2cyl engines. I also never had much luck with aftermarket gauges except on Mercs. I always find an OEM tach on E-bay or a marine surplus store as Teleflex etc always seem to be incorrect. They do make small tachs that clip onto a plug wire for smaller engines. Not sure how they work either but it wold be attached to the engine so you have to either turn back to look or possible extend the wiring to reach the dash. Again, these all might interfere with accuracy. If a tach is not accurate, what good is it?