Rodi pressure gauge bouncing after booster pump install

[the.cornish.reefer]

Just installed a booster pump to my rodi unit and this is my 1st time using one.
However since installing the pressure gauge bounces like crazy, below is how I have it setup.
Now I'm wondering do I have air in the system? Or is it the gauge?

 

[Dan_P]

Just installed a booster pump to my rodi unit and this is my 1st time using one.
However since installing the pressure gauge bounces like crazy, below is how I have it setup.
Now I'm wondering do I have air in the system? Or is it the gauge?

Might be normal for this type of pump?

 

[the.cornish.reefer]

Might be normal for this type of pump?

Possibly, I read on another thread on here about putting a needle valve between the gauge and the 't piece' so ive ordered this from amazon to try