Chain tension and tensioning a chain

The chain is not only tight because the rear sprocket is bigger but it is wider. So if you are running a 3/32 chain the 1/8 sprocket is too wide and will be VERY TIGHT dont ride it until you get the sprockets/ chain matching or at least sprockets thinner than the chain.

IF he had the wrong combination of 3/32 chain and 1/8 sprocket it would be more than very tight wouldn't it? It would be rideable as the chain wouldn't mesh with the sprocket at all.