I tech check at the champs... with your bottle being turned on through the arm i wouldnt pass it, it means putting yourself in harms way to gas up/ shut of the gas.

I also dont like the idea of pulling on your relief valve to act as a dump... your dump needs to be open at all times up until the point you gas up in the arena... put a ball valve in there. You can get cheap, lightweight, plastic push in ones easily to put on your low pressure side.

Ideally your gas on/off valve, the ball valve, LED and link should all be in close proximity, so if you can mount them all closely on the rear of your robot, this would be prefered as it makes things easy for the arena marshall when the time comes to shut your robot down.

Hope this makes it clear.