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the super hi flow valves NOS sell has the gauge where you inquired.
You want to be able to read bottle pressure with the valve closed, whether your heating the bottle or if the in car temps are high so you can cool it if needed.
It doesnt hurt to have both - 1 in line, 1 on the bottle.
I had an in line only from dyno tune and it was also used with the dyno tune pressure sw for the heater.
Most n2o explosions happen because of a solenoid that passes, why would you want to have your bottle open so long? You could fill your intake with n2o and not know it until you crank over the car and boom.
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