Abstrakt Instruments VS-1 Assembly Manual page 16

Connect the CN16 & CN17 ribbon cables, power on the unit, and re-test the +/-15V analog supply voltages to make sure there are
no obvious faults w/ the output board connected. If desired, you can first test the output board without the IC's installed.
STEP 14: INSTALL OLED TO PANELBOARD
https://youtu.be/fIApntb4T8E
(4) #4 x 9/32" White Plastic Spacer (green) (Bag 2)
(4) 4-40 x 5/8" Phillips Flat Head Screw (pink) (Bag 2)
(4) 4-40 Lock Nut (purple) (Bag 2)
(1) 4-Pin Header (Bag 2)
Install the 4-pin header into the OLED. Mount the module into the Panelboard using the spacers, flathead screws and lock nuts.
The OLED screen is mounted into the panelboard upside-down.
Note: If sourcing your own OLED module make sure the pinout is correct - 1.3" OLED modules are sold with different pinouts.
When viewed from the front the pinout should be GND - VCC - SCL - SDA.