I have made a library for the arduino for the LCD display EA-DIP204 in Serial Mode. In this way you only need 2 wires, a clock and a data line. You do however need to solder a connection on the LCD print to make it be able to work in this way. How to do that is visible on the datasheet.
ks0073.pdf (674 KB)
dip204-4e.pdf (267 KB)
eadip204.zip (9.96 KB)