I agree with you about how nice flashers are in allowing one to discern thermoclines, surface noises, and any hull
effects on the signals that cannot be discerned with digital only displays.
Consider keeping your flasher as a backup and buying
an LCD recording depthsounder that uses the same frequency transducer
that you already have. It will be either 100kHz, 200kHz or 50kHz and is probably 100kHz.
The good displays show everything that your flasher shows and, in addition, shows the bottom trend as you move along. It will not be long before you begin to really appreciate that feature when anchoring
or approaching relatively shallow and variable bottoms. If you decide to replace the transducer
get one with the speed and water
temperature built in and you will also appreciate being able to at-a-glance tell how warm/cold is the water before jumping in. You almost get those other features for "free" in addition perhaps to a voltage reading (obviously measured at the input lead to the display). These items merely appear in a relatively-out-of-the-way place on the display and do not intrude on the graph and digital display.
Sitex makes one, there are other good ones as well.