Transmitters Plus Button Gauges: Why I Use Both

Disclosure: This is an independent account of equipment I use or have used. I work in the diving industry and sell some of the brands or products mentioned, but I am not paid or sponsored to promote them and none of the equipment discussed here was supplied to me free. My preferences are personal conclusions from use, not universal buying advice.

Safety note: Equipment articles cannot replace formal scuba or technical-diving training, a manufacturer manual, a gas plan or a dive plan. Configuration choices must make sense for the diver, environment, team and training involved.

Electronic convenience with a simple local backup.

Electronic convenience with a simple local backup. Regulators are one of the places where I want the equipment to become boring: predictable breathing, clean routing and no drama.

What I value in use

On my sidemount cylinders I use transmitters that send pressure data to the Shearwater Perdix 2. I also like having a very small local pressure reference at the first stage.

The combination gives me the convenience of seeing both cylinders on the computer while keeping a simple independent way to confirm that a cylinder contains pressure. Redundancy does not have to mean carrying a full duplicate of every object. The full before-during-after reasoning is in why I finally trust wireless air integration in sidemount.

The practical point

My preference is personal, but the criteria are transferable: breathing performance, routing, serviceability, reliability and a configuration that still makes sense when something goes wrong.

Wireless pressure is my primary display, while the small mechanical gauge remains directly readable.

Two ways to answer one important question

The important question is “how much gas is in this cylinder?” My primary answer is electronic: two transmitters send pressure to the Perdix 2 so both cylinders are visible on my wrist. My backup answer is mechanical: each DST still carries a compact button gauge angled so I can read it directly if electronic pressure data is lost.

That is pressure-indication redundancy, not complete-system redundancy. If a valve, first stage or cylinder has another type of failure, the tiny gauge does not magically solve it. Precision in language matters because redundancy is only useful when we know which failure it covers.

My regulator priority is boring reliability

A regulator is one of the few products where the best long-term story may be that nothing dramatic happened. My Apeks regulators have given me years of uneventful breathing. They have not provided the cinematic failure story that makes a good anecdote, and I consider that a compliment. At depth I want the second stage to breathe predictably, the hoses to stay where they belong and the first stage to tolerate the routing I ask of it.

The DST architecture is particularly useful to me because the rotating turret gives the medium-pressure hoses freedom to find a natural route. In sidemount I can arrange second-stage, inflator and drysuit hoses without forcing sharp bends. Apeks documents four medium-pressure ports on the turret, two high-pressure ports, and a fifth-port option/variant that makes end-on hose routing possible. The XTX50 second stage is pneumatically balanced and includes user controls for breathing resistance and venturi assistance. Those specifications matter because they support configuration choices; they are not a substitute for correct servicing or training.

Pressure information: digital primary, mechanical fallback

My current sidemount system uses wireless transmitters as the normal pressure display because I can see both cylinders at the wrist. Small button gauges remain at the first stages. They are not a magical backup for every possible regulator or cylinder failure; they are an independent mechanical way of reading cylinder pressure if the electronic pressure information disappears. That distinction is important. The full reasoning is in my digital sidemount gas-management configuration.

Routing is a safety and ergonomics issue

A hose that is technically connected but constantly catches, bows away from the body or has to be fought every time I move is not good routing. Good routing keeps controls accessible, protects vulnerable components and makes normal actions repeatable. I want to be able to identify what I am breathing, reach what I need and avoid adding movements simply to read information or tidy the system.

What I would tell a diver shopping for regulators

Do not begin with a brand argument. Ask whether the first stage can be routed cleanly for the intended configuration, whether the second stage breathes and adjusts in a way you understand, whether local service support exists, and whether the connection/pressure rating matches the cylinders you will actually use. Then judge reliability over time, not from one perfect pool breath.