How can I connect my new Win 10 PC and my old Win 8 PC together to 1 monitor, all to my Direct Tv router that I use to connect my wireless gadgets?

The goal here is unclear. Sometimes folk want both PCs to show at the same time on one monitor. That can be done by going headless on one of the PCs and then using a remote contol app like VNC to show the other PC's screen in the PC connected to the one monitor.

Others may use another video connection to the (unknown make, model) monitor and select which PC to show with a "select input" button on the monitor.

How you do this depends on your needs and skills and what the monitor and PCs have for video connections.

We used to use a KVM switch to use one monitor/mouse/keyboard on multiple servers. Staples has one for $35.

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