Use a VGA cable to connect your VGA monitor or compatible HDTV to the video port on your computer or in connection with your KVM switch or video splitter.
The high quality sheath houses separate 75 ohm coaxial cables. Using 75 ohm cable to carry RGB signals avoids interference and signal loss.
Not always clear what devices you need to build a system
I think putting every thing you need from start to finish would be simpler. In my case I ordered more than I needed to make sure I had everything I needed. I had duplicate items but at minimal cost. No big deal but the items required could have been shown more clearly.