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CP gauges are nice, since they're 200 psi vs. 300 psi stock. Therefore you can tell what your lpr pressure is MUCH more accurately. But the only reason I got them is because one of my 2 stock ones broke, and I needed a 200+ psi gauge for something else, so I just used the stock for that, and put 200 psi gauges on both of the Quests.
If the stock reg is working, an aftermarket reg won't do anything for you. The only reason I don't have the stock regs on them is because I bought them that way. Although I DO HAVE the stock blue reg for that one, I've never bothered switching it back out, since I prefer the bottom input instead of top input.
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