Just cut the cable's ans strip and twist the insulated copper cables together and solder to the tip from the BNC connector, then twist the mass leads also together en solder that to the mass rrom the BNC connector.
Maybe you can buy a VGA to 4 BNC cable. I do not now if they exists. You have to check at you're local store. I asked over-here, in my local store and they looked at me if they could see pigs fly. So i made it myself.
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