Epson Endeavor WG - Manual (Page 75)

2. Attach one end of the cable to the alternate VGA interface on
the main system board near the back panel, as shown
below. Align the cable so the red wire along one edge is
closest to pin 1 in the socket.
3. Connect the other end of the cable to the appropriate
interface on the adapter card. (Check your graphics card
manual for instructions.)
Installing and Removing Options 2-23