When I upgraded to the Scubapro Luna w/ transmitter, I kept my hoses as a back-up. I was asked why, since my computer has the same information (and more) than my gauge set has. I felt that a little redundancy couldn’t hurt. My reg set is an older Aqualung Titan that only has one HP port. I found a HP splitter on eBay which works quite well. I’ve been told the computers hardly ever fail. My luck, I’d be one of the few cases that it would. I actually find myself confirming the computer with the gauges from time to time. So far, so good!