uLCD-144-G2 as voltmeter

Hello there, I have tasked myself with making an voltmeter. For this project I'm using an arduino nano and an ulcd 144-g2 from 4dsystems. The values I need to get on the screen are 24V, 1.999 A and a potential diffrence of -1850mV. I'm aware that I can't put 24V directly on the arduino and that I need a shut for the amps. The trubble starts when i want to connect the arduino to the screen and get the values on display, I have looked at the datasheet for the screen but I didn't find anything i could use in there, link the the productpage below.
thanks

productpage of the LCD: