Pleasure Way would know and would likely be happy to help. probably a Manchester tank but call them to confirm.
Does your RV show the propane level inside the coach? If so, there would be wires leading from the gauge.
remote sender.jpg
The other type I know of is a basic snap on.
snap on no remote.jpg
To calibrate when replacing you need to fill the tank then use a magnet on the back of the gauge to rotate the gauge dial needle to Full then install the gauge.