There is no manufacturer installed depth finder on any Yamaha model at this time. The cruiser models do have water/air temperature, fuel flow meter, compass, trip calculator, etc. Also you cannot easily swap out a cruiser instrument panel for a ski that does not have one. You would also have to install the necessary sensors (air/water temp., compass, fuel management, etc.). It would not be cost effective to try to do this............I don't think your dealer has ever tried it or he would know.
A number of guys have successfully installed various depth/fish finders on their skis. The type and brand of model is not as important as the transducer. Most guys have gone with a "shoot through the hull" type of transducer. Getting it located in the proper spot to get a good reading can be a challenge with all the turbulance under a ski hull. On the FXs most guys are locating it back near the battery area, but you may have to move it around some to find the best spot.
There are several long threads on this subject in this and other fourms.........try a search. Here is one:
http://www.pwctoday.com/f14/through-...xho-71489.html