docdrs, if your boat is wired with the tower speakers on it's own amp, or on 2 channels of a 4ch amp, you can install one of the pac lc1's pretty easy. just install it inline of the rca cables.
if it's on a 4ch amp that only has a stereo set feeding it, you will need to rca-split the signal either at the amp or the source giving you 4ch input then install the pac inline of the tower channel..
