I am going to guess that your TV has composite connectors, Red/White and Yellow(Video) Would this be correct?

How many sets of connectors are on the TV? If only a single set then connect everything to the 1050 and then make a single connection to the TV from the 1050.

I would connect the Dish to the 1050 using optical. I would connect the DVD to the 1050 using optical.

Then for video I would connect BOTH the Dish and DVD to the 1050 using S-Video and then connect the 1050 to the TV using the only connection type you have; RCA. Or if you want, you can connect Dish and DVD to the 1050 using Composite(RCA) and then connect the 1050 to the TV the same way. But you will ONLY need a single Yellow RCA cable as the white and red are for audio.

My preference would be to use the S-video for when you get a newer TV.

I am not doing any video switching with the 1050, only audio switching. My TV has 4 video inputs.