The black tanks on the outside. think they are 80 bar but might be higher. That is the pressurization system who currently keeps tanks at 6 bar and feed the cold gas trusters and will feed the gas-gas engines.
The gas-gas engines will be a bit like the raptors starters who also is gas-gas. Probably use multiple spark plugs to ensure smooth starts.
Guess they use an gas generator and perhaps electrical pumps to create pressurized gas in case they run low on it say during docking and then they need to pressurize the large tanks, that one however don't need high pressure.
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