For the polyairs I use one of my bicycle gauges that reads from 0 to 60psi. You can get digital gauges from bike shops that read below 5psi as well as conventional bourdon gauges.
My 150 build - http://www.pradopoint.com/showthread.php?27423-A-Random-approach-to-a-Bluestorm-150-GXL-D4D-automatic
Shock gauges for pushbikes and motorbikes will normally read low as well. I personally use a Longacre 30PSI gauge which increments in .5 from 1 psi. (not cheap tho)..
Don't lash out and buy a shock pump without looking at it carefully. Both mine (Fox and Rockshox) have very small gauges and neither will register below 15psi. Be nice if they did though...
My 150 build - http://www.pradopoint.com/showthread.php?27423-A-Random-approach-to-a-Bluestorm-150-GXL-D4D-automatic
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