460 w/ Victor Manifold - Water Pump Hose Routing?

I've got a question about using a Victor manifold and Edelbrock water pump in an application that requires a heater core as well as a temperature sending unit.

I've attached a diagram that essentially labels all the ports. A & B are on the manifold and C & D are on the water pump. B is supposed to connect to C as a thermostat bypass (I think, not sure). A could then run to F, the heater core feed, and then E to D as the heater core return.

However, that leaves no place to screw in the temperature sending unit.

Questions:

*Is the B/C connection the thermostat bypass? If so it seems large.
*Would a 1/8" hole in the thermostat enough of a bypass for the system? Seems to work for many cars.

Or, do I have it all wrong and it works like this:

C supplies the heater core
D is the heater core return
A can be plugged
B can be used for the temp sender

If what I wrote above is correct then I'm good to go.

I can also pull the manifold and tap a hole back on the back side of it to get access to head water, but I'd like to avoid that if possible.