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This gauge will save you a couple of dollars to put towards your bp/w.
https://www.divegearexpress.com/compact-ip-gauge
The purge feature on the deluxe gauge is not necessary. Purging your second stage accomplishes the same thing. I take a gauge with me on local dives, and when traveling. If servicing your own regs is something that might interest you, Titan kits are easily purchased, and will be around for a long time.