12:1 is the target value when running on nitrous, so it would be unsafe to add ANY nitrous with the mixture already running at that ratio. Although we don't sell Power Commanders and I've never used one and nor would I recommend them as a consequence, I believe they have the ability to add fuel under certain circumstances. If yours has that ability then it's likely that you can get by with a dry nitrous system.
Having said all the above, it is better to fit a wet system, as it's the only sure way to be able to achieve the desired AFR and maintain total reliability.
_________________ Regards
Trev (The WIZARD of NOS)
30 years of nitrous experience and counting!!!!
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