With the water supply valve open all of the way, the Flow Rate on the Water meter reads ".000" I found out that the leak showing up on the meter was from the basement toilet reservoir.
How hard should I tap it? With the water supply valve open, there is no change in pressure.
The furnace is currently off and showing 0 psi at 120f.
When the furnace is turned on, the Taco pump sounds like this -