The pressure required in the newer types is is quite low (only abt 30-50psi), so any bike pump with
a screw-on schrader hose should be able to manage it. (Press-on and clamp-on types won't fit the
Marzocchi set-up.) The problem is that the pressure needs to be set accurately, so a good pressure
gauge is highly desirable, and there will be lots of air loss (and pressure change) when you
unscrew the hose.
Best to get a proper shock pump; preferably one with a smart fitting to control the air loss
problem, and one with a gauge that can be read accurately at LOW pressures). Not cheap.
Or else just make friends with your LBS.