You'll also benefit from a remote gage like below (Raptor shift light is nice too) I never look at the tach.....
I have to concentrate on the road too much now!
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You got to know what you're pressure is too. I don't spray if it's below 850psi. NOS works the best between 950 - 1050. That's where the heaters come in. NOS can't get to that pressure without them even when the tanks are full so.....anyway I can tell a huge difference in it when the pressure is where it's suppose to be.
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And this is my remote pendant for the dual heaters/openers and purge. I made that so I didn't have to drill any holes in anything. I have a bracket behind the center console holding it up. That way if I ever remove the NOS you'll never know it was there. All of it right at my fingertips. Oh and my rear defrost button (or mystery switch) is what activates my progressive controller or should I say turn on my NOS. I run a progressive controller that I've set to come on and off at certain RPM's. I call it NOS for dummies.
Oh and I forgot to mention the bottles should face forward and not sideways. The pick up tubes are designed that way.