A few things we do in the HVAC Business to get accurate readings on guages is :
1. the mounting should have a isolator between the intake and the bracket .. like a rubber gromit between the inate and bracket.
2. As Boss said A glycerin-filled mechanical gauge will damp the needle-shake .. which I have seen in automotive guages.
3. We use a device called a snubber. They suppress pressure pulses and pressure peaks ..They make them in 1/4" so you caould put it on the back of the guage and then attach the tubing.
4. Last but not least on guages we mount with capilary tubes ..we usually leave a nice coil of 4 loops ...this acts as a suppressor ... but mostly in high pressure applications.
My opinion ...buy a 1/4" snubber and be done with it.
Ron
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