Dave
Another option is to change to
KAVLICO Pn. P4055-75G
Same as later dynon and Garmin g3x. I did this for my D180. You just need to change the sensor type in the settings.
Peter
The VDO is a resistive sensor and the Kavlico is a transducer. Swapping will require some wiring work as well, as the transducer requires a 5V power source.