Results!
Tom - I'll see if I can get a pic of the installation tomorrow. It might be hard to photograph. It was pretty hard finding a place for the tank - if I recall, the instructions had me install it below the level of the water pump in the heater core return hose.
Also, I did a poor job installing it. I need to secure it better - it's kind of free floating (as much as something can be in the middle of a heater hose - but I have heard it thunk against the firewall a few times over bumps once in a while.