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If water/pump pressure is below 9 bar, then you will have to adjust the pump. Remove the right side panel, pump is usually located there, find the big brass head with 2 water lines coming to it, on the side of it is an adjustment nut and or screw depending on pump model. Adjust tighter gives more pressure.
here is the site where you can get your presure gauge and other parts for your machine.http://www.espressoparts.com/results.cgis?catalog=&select=NAME&keywords=astoria+pressure+gauge&image.x=15&image.y=14
Yes, your pressure stat should turn off once in the "green" area. In most cases a pressure stat works or it doesn't. A lot of times carbon build up on the contacts is the issue. They are sensitive and can break off easily when your cleaning them so be careful. Also make sure the machine is turned off before doing any work (220v = ouch!).
When you press the dispense button does the needle on the dispensing pressure gauge move up to the green area? If so, most likely your group head solenoid valve is bad. It's located behind the back splash. It's a small black box connected to a metal tube just behind the group head. They cost around $70.
If the needle doesn't move it could either be your pump or motor. Now you're in the $200 range.