To run 2 transducers through one unit, you have to purchase a switch TS2-W and then a in hull transducer. I purchased mine through jandhproducts.com about a week ago, it hasnt shown up but should be anytime. http://www.jandhproducts.com/_e/gdept/0 … sories.htm You can use XP-9-QB-90-T transducer, I know there is another one but cant think of it and it is cheaper than this one.Last edited by tae73 on May 22nd, 2008, 12:54 am, edited 2 times in total.