It wont change the reading unless the bottle is open other wise the pressure isn't in the line and thus your bottle pressure gauge isn't doing shit. They don't get that hot around 85* is what they heat up to. And just because you can purge doesn't mean there is alot of nitrous in there. Once they get low around say 1lb or less your bottle will be very hard to get any pressure out of it. The less nitrous you have in the bottle the longer it takes to heat it up and get enough pressure. I usually take mine out once they get below say 800 psi with the heater on and top them off to get topped off. They normally have 1-2 lbs of nitrous in them.
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Dustin
2002 GT Mustang 5-Speed
Drag Radials,Sprayed,Powershifted
 
WOOO HOOOO!
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