Connect the 4-conductor ribbon cable from the LCD board on the lid to the 4-pin header on the EVSE board. The green (ground) wire connects to the pin with the square solder pad next to the screw. Use the 4-pin header at the edge of the board, not the 6-pin header next to it.

Connect the power cable to a 120V power source. Verify that the LCD panel lights up, and is readable. Adjust the trimpot on the LCD board if necessary.

Optionally, insert a 3V 12mm button cell (CR1220, 1225, 1216) into the battery slot on the LCD board, to provide power for the time-of-day clock.

Fit the lid to the box, and secure with the 6 long screws.