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I have an 08 Ultra w/ABS. To add the siren all I had to do is take the left side cover off, slip the unit into the retaining clips and plug the siren in. Replace the left cover and your done. The manual and instructions say to remove the right cover but maybe that's for non ABS bikes. Whatever no tools.
Same on my 2010 FLHTK. Throw away the instructions; they're almost completely useless.