Measuring shocks' air pressure

[Back_in_the_Saddle]

The manual for the Kawasaki Vulcan 1500 doesn't recommend using a tire gauge to measure the air pressure in the shocks because leakage can affect the results. What type of gauge should one use?

[Dichotomous]

how much pressure are we talking here?
there are mountain bike shock pumps that work extremely well for this type thing if its a schrader valve (same as on car and motorcycle tires) and you can get them in 0-100psi or 0-300psi. if you dont need to go over 100 psi, dont get the 300psi ones cause they are less accurate. I have one for my fork that is the 100psi style and I think it was about $15-20. it has a screw on design that loses VERY little air pressure, and a small button that you can press to lower pressure while its still attached. I know its accurate cause on my mountain bike I can feel a difference of 2-5psi. on a 700lb cruiser I dont think you would notice like on a 32lb K2....