i have a nitrous pressure and i know once that starts reading low psi it means you are starting to run out but i was wondering if theres a gauges that tells me exactly how much i have left or something like that or is it a waste and should i just go by the one i have. like im not sure if they have one that connects to the bottle or what have you. if anyojne knows and can provide a link it'll be appreciated

 

The only gauges I know of are what you have. Temperature will also affect the gauge reading. The lower the temp the lower the psi.

 

no u have to weigh the bottle to know how much is left.