SPG vs. Air-Integrated Computers:
Pros, Cons & What’s Best for You

A pressure gauge is one of the most critical pieces of scuba equipment, allowing you to monitor how much gas remains in your tank. But should you rely on a traditional submersible pressure gauge (SPG) or switch to an air-integrated (AI) dive computer? Both have their pros and cons—here’s what you need to know.

What is an SPG?

A Submersible Pressure Gauge (SPG) is a mechanical gauge that connects to your first stage via a high-pressure hose, providing a direct reading of your tank pressure.


Pros of an SPG:

Cons of an SPG:


What is an Air-Integrated Dive Computer?

An air-integrated (AI) dive computer connects to your tank either via a wireless transmitter or a hose-connected console, displaying real-time pressure data and calculating estimated remaining dive time based on your gas consumption rate.

Pros of an AI Computer:

Cons of an AI Computer:


Comparison Table: SPG vs. AI Dive Computer

Feature SPG Air-Integrated Computer
Reliability Extremely reliable Dependent on battery & electronics
Cost Affordable Expensive
Ease of Use Simple & intuitive More complex setup & pairing
Data Tracking No gas consumption tracking Real-time SAC rate & gas time remaining
Alerts & Warnings None Low gas alarms, turn pressure alerts
Hose-Free Option No Wireless AI models available
Failure Risk Low (mechanical) Higher (electronics, batteries, signal loss)

What’s Best for You?

Choose an SPG if:

Choose an AI Computer if:

The Best of Both Worlds?

Some divers use both—an air-integrated dive computer for convenience and an SPG as a backup in case of electronics failure. This is a popular choice among divers who want the benefits of AI while maintaining a fail-safe. This is usually what I do unless I'm trying to maximum weight savings, then I remove the SPG.


Final Thoughts

SPGs are simple and fail-proof, while air-integrated computers offer modern tracking and convenience. There’s no one-size-fits-all answer—it depends on your priorities. If in doubt, start with an SPG and upgrade later if you want the benefits of AI integration.