I'm going to put my bottle in the spare tire area and bought an electric N2O pressure gauge so I can monitor pressure from the cabin. Would you recommend putting the pressure sensor off the feedline (only shows pressure when bottle is open) or off the side of the valve assembly (shows pressure in bottle at all times)? I rarely go to the track and will be using the N2O for fun on the street mostly.

I'm thinking that off the side of the bottle makes a lot of sense so that I know if my pressure is high enough before opening the bottle, but then I'd have a lot of stuff hanging off the side of the bottle. It would basically look like this but with one more pressure sensor for the gauge on that side manifold (picture borrowed from a post by Beer99C5)


I already have a small analog gauges on the bottle and was going to mount my pressure switch off the valve side port as well so I don't have to worry about over heating.

 

I do mine on the bottle itself, some guys do it on the line.. its all personal preference...
I prefer to know exactly whats in the bottle before I open it, and that way if theres a problem, I can crack the valve and let some pressure out first

because my bottle heaters are controlled by my Holley EFI Dominator
IF I turn on my heater, by accident or on purpose, and I have forgotten to open the valve, I wont accidentally overheat the bottle because the sensor is on the bottle side before the Valve.

other guys like the sensor on the line so they know when their bottle is really opened or closed...

 

Id go with feed line... If you ever get another bottle youll need another sender.

 

I was originally thinking bottle, but since I made my own remote bottle opener, the feedline will be nice to monitor that the bottle opened/closed properly. hmmmm.....

 

i prefer under the hood to see what pressure the motor is seeing and i change bottles often.

 

the downside of a sensor under the hood is that most of the high pressure sensors made for nitrous, are susceptible to vibration damage...
not saying it wont survive up there, but you are more likely to have one just quit or read wrong because of the constant vibration up front...totally dependent on how its mounted of course.

 

I have mine on the bottle valve

 

I hadn't heard that. Thanks for sharing.

 

Quasi-related question.... do most of you wire the gauge to be switched on directly through the 12V switched source, or do you tap it into one of the switches, such as the arm switch, so it only turns on when you have your nitrous system on?

 

Direct to 12v Ignition on power

 

what kind of adapter is needed if you are going directly off of a bottle? if it already has a liquid filled gauge on the bottle, can you just take that one off and screw on the pressure switch for the gauge?

 

1/8 npt on most sensors....
many bottles have multiple ports on the bottle before the valve...

 

if your bottle only has 1 port...
then you can get a 1/8 npt TEE fitting and use that as you still should have a pressure gauge on the bottle for a quick visual reference for anytime tha gauge is not active(like when filling the bottle or when the car is shut off just for some examples...

any 1/8 NPT brass fitting from Home Depot/Lowes/Hardware store of your choice will do the job...