Brett Miller wrote:
I realize I am not very knowledgeable in this area, that
is why I am asking for help. Perhaps you are use to 40 psi,
but I am not. The shower is very pathetic, the water from
the sink hardly flows and takes forever to fill the sink.
The sprayer from the sink just dribbles. The hose pressure
is too low to clean anything.

The regulator is probably the first thing that the cold water line goes
to inside your house. It has an adjustable setting and an internal
filter screen that could become obstructed. Over time they tend to fill
with lime deposits. Perhaps you will need to replace yours. Maybe you
should also disassemble and inspect your fixtures and check for lime
and for half closed valves. I once had a new showerhead that was
worthless until I took it apart and removed an idiotic plastic
"thingie" that restricted the water flow. You fail to tell us how low
the pressure drops when you have water running. Mine is set to 50 and
drops to about 40 with running water.

You might also run a new pipe from the unregulated side to your outdoor
faucet.