Gauge won't drop to zero

It should. Did you snip the tip off the little black insert on the top of the guage? If not, you might try that and see if it drops it to Zero. It's a pressure equalizer, and doing this might fix it.
 
Pull open the little doo-dad on the top to equalize the pressure.

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Weirdly I noticed mine was only going down to about 2 PSI. I pulled the black rubber stopper off and the pressure reading actually went up which was not expected. So I shoved the stopper back on and the pressure seemed to go down closer to 0 and I called it good enough :)
 
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