My upper helm depth sounder quit working recently, which now leaves me with no working depth gauge on the boat. Last time I was in the water, I cleaned the crud off the transducer, which has worked for me in years past, but not this time. It just throws random numbers around that are completely inaccurate.

What's my possible causes and fixes for this?

The transducer is located on the very back of the boat and the wire runs about 60' to it. What's the odds I can still find the correct transducer and that length of wire to run to it again?