Tank gauges

I’m so close to finally shooting my Texan. I bought I’m on my second compressor, the first one didn’t work correctly. I just got a new one today started to fill my tank and the gauges started to move (Finally). I stopped because I’m not real sure what each gauge means on the tank. Obviously one measures what’s in the tank, but I’m not sure what one. The other I’m not sure what it measures. Hopefully someone can help.

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Yes. Set your stop at the line halfway between 4000 and 5000 psi on the compressor. If you look closely, on the inside scale it will be at 310 bar. The red on the gauge has nothing to do with redlining if that's what is bothering you.
Yes the red area in the gauge was bothering me. Red usually means bad. lol. But I pumped my bottle to 4000 and she’s been holding for 24 hrs now. Finally able to freaking shoot my gun. Now I need a chronograph to find out how fast she is. Thank you for the reply.