Welcome to the forum!
If your machine was sunk, I’m sure you have more than one issue going on
Once you get water inside the speedometers and it sits for a period of time, it pretty much destroys the circuit card
Get that top cover off and get a few pictures of what you have going on
Your machine should still shift electronically.
The ECU system will shut off electric shifting if it does not get the speed signal which is routed through the speedometer, but it should start shifting again once you turn the key off and then back on
I will send my contact information to your message box as well
-AKATV