Anyone have a good used Datamarine depth sounder for sale? Mine was intermitant, I cleaned RCA connector on rear of gage and cable. Worked for a while but now only reads the no data code. Not sure if gage or sounder is bad. Cable was replaced by previous owner, spliced on new cable. Cable test good with meter (but cable was shortened?) Worked fine for 5 yrs.- now? Would like to find good used gage to verify if my gage or sounder is bad.