Harry, your concept about pony gauges is exactly why divers on deep wrecks off North Carolina use them. The wrecks are deep, boats rides are long- 3, 4, 5 plus hours one way on seas that often beat you and equipment to death. It is reassuring after all that to know you still have gas in bottles. But, if it is a real problem you can overcome by restricting your wreck diving to the historical ones in Florida and Hawaii.
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