Going to mount the transducer on the jackplate for SI. Need another ducer to shoot through running at speed. Do they have a split set up for this unit or would I just have to unplug one and plug the other in? I know this is an older unit now and don't know about part availability. Do they make a split version? what is the part number? what would be the part number of a shoot thru transducer stand alone? wondering if it is even worth the cost? Thanks for any help.CF