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I would like to use my Garmin 240 fishfinder as a simple shallow water sidescan. If if could use two transducers (not simultaneously) to look down and sideways that would be great. So I need a switchbox to toggle between the transducers. Would any be able to advise the part numbers of the connector at the end of the transducer cable? Unfortunately Garmin (UK) will not help. Many thanks.