FX Impact MKII - Installed Huma Tuning regulator now no tuning pressure reading

First, please don’t lecture me on leaving well enough alone, I am feeling sick / ill / stressed, freaking out!!!

Here is what happened, I opted to install a Huma tuning regulator into my new FX Impact MK II Compact.

I watched AirBuks video and all went smoothly step for step. Then I reinstalled the Amp tuning regulator and pressurized the rifle. The gun charged up and I fired some dry fires with the gun pressured and all seemed okay, but the tuning regulator in now not showing any pressure.

Can you please give me some idea what the problem might be?
 
Okay need a new screw driver for adjustment I will get it tomorrow, but here is the install and the Saber Tactical bag rider.

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