i have a built in fish finder in my 01 sprint 290DC i was wondering how i could go to replacing with a new one it is defective and all i really want is for dept. any suggestions on a good enough but not expensive fish finder or if it is possible to have it replaced in the same area as my built in one....will it be same wireing to my batterie....is it something i can do myself....thanks guys.........any info would be awsome