Welcome to the site Jenn, sorry I'm a late in replying. I've been reading this thread but forgot to say Hi
Had nitrous on my Puma too, when I had a Puma

. It was far too addictive for me & I spent far too much on refills

Mine was a stealthy-er instal so you couldn't see anything when you looked under the bonnet, buttons next to the steering wheel (one was to manually switch on radiator fan for extra spirited driving lol), controller in the glove box like capri has & an extra pressure gage inside the car down low in the passenger footwell.
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Try not to go down that rabbit hole