GlowShift boost gauge response

[SquareOne]

13 Cascadia w/ ISX....everything in factory form. Just installed the GlowShift boost/pyro gauges and had a question...

- How responsive are the GlowShiftboost gauges? If I'm not mistaken, aren't they stepper motors?

I ask because it seems I should be reading a few PSI at idle (being full factory emission system). If I give it a quick stab in neutral to 14-1500, it will jump the gauge quickly to about 9psi then quickly return to 0. I haven't taken the truck out yet to see any other readings so it very well may be fine. At a low idle (although I havent verified with Insite yet) you can def hear the turbo whistle which is leading to the conclusion of it generating a few PSI.

FYI, using the port on the top the intake manifold (right behind where the EGR pipe comes in).

Thanks guys