How can I remedy low water pressure at shower and other faucets throughout the house? I have a shallow well.

What does the pressure gauge show when the pump is off?
What kind of tank do you have and how big is it?
What does the pressure gauge show when a faucet is open and the pump is running?

Has the pressure always been low, or is it a new occurrence? If it's a new problem, check any whole house water filters, and if you have a water softener, put it on bypass. Let us know what you find.