"bud" wrote in
oups.com:

Any thoughts on this? If not reasonable, do I just install the new
through hull transducers and leave the old ones in? or remove the old
ones and try to fit the new ones in the same holes?



The old ones are probably not even on the same frequency as the new ones.
The old ones are probably, just guessing, 90 Khz units. New transducers in
more sophisticated systems use 200 Khz for better resolution of the bottom
and fish.

Never connect old transducers from one system to the transmitter from
another.....