[IC27A] Depth Sounder

[summerwind6264]

I have a 1986 Catalina 27 that needs a new depth sounder.  I think it is 
original one, Horizon DS-1.  I would like to replace with a low cost one and 
one that will fit in 4"hole and 1 3/4 thru hull transducer.  Any 
recommendations?