Follow up email from Chris Coffee service dept.
"If you are using the machine with a water jug then you should use a demand
pump like this:
http://www.chriscoffee.com/products/hom ... ing/flojet
This is very important because if the machine is used without the pump then
it can damage the rotary pump inside the machine and cause a leak which can
then damage other components or cause water damage at your home. As far as
gauge pressure goes the left side is the pump pressure gauge and will not
show any pressure unless the machine is plumbed in or the pump gets
activated.
The right side is the boiler/steam side of the gauge and will only show
pressure if the steam boiler is turned on. Feel free to contact me with any
questions.
Regards,
Jason Verenini
Chris' Coffee"
The left side isn't the boiler pressure but actually the pump pressure. So I'm on my way to Lowe's for a few plumbing items I guess.