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We've been discussing this since the 1980s, when they were introduced! You have two choices, either buy the 'proper' gauge with dial (H-D or aftermarket), or get used to the simple fact that checking with a normal tyre gauge loses air. I've been setting my air suspension for over 20 years using a bicycle pump and tyre gauge, simply setting the pressures to take into account the loss.
With a little experience you will find that a certain pressure suits you when solo, perhaps another when 2-up. They may be quite different to other riders you meet. If you continue with what you currently have, simply get used to setting a pressure, as you have already.
When there is only 4 or 5 "psst's" of air in there in the first place, it doesn't take much.
Exactly, an ant farts enough air to fill your rear shock lines. Even though HD's gauge is $pendy, it's the best one I've used to check, fill & bleed air from the system.
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