4-20mA shield compatibility and requirements

I have a system built on an Arduino Mega using a 4-20mA shield which has failed and is no longer available. I would like to change to the NCD shield and I was wondering if it is compatible with the Arduino Mega. Also, can I connect it straight to the Arduino or is it necessary to use an I2C interface. Thanks in advance.

you can use i2c straight out of the arduino.