Think there's a bit of confusion over what the gauge should do...
So for a modern Zodiac/Bombard both the suplied footpump hose and the end of the Bravo 12v pump hose are of a diameter that push fits in the Aerotec air floor valve. For the larger tube valves there is an adaptor which usually comes tied to the end of the OE Zodiac footpump hose and also is usually supplied with a gauge.
See my pic this adaptor can randomly come with or without the inner bar that opens the valve which makes pumping easier and also allows the Bravo 12V pump to stay in its LP turbine mode for longer.
The gauge supplied by Zodiac/Bombard these days seems to be a Bravo branded one as in my images. Note it has a non-return flap (should have anyway) with the port from the tube bit to the gauge being below this flap so if you apply pressure to the bottom of the tube it will register a pressure.
All my previous older Zodiacs would let by on the valves with the cap as a final seal. I've only just noticed my new Aerotec with the later valves is the first where the tube valves hold with no audible pressure loss.
So to check the pressures on the Aerotec today...
Tubes: As there is no let by on the tube valves you need to put an adaptor with a crosspiece on the bottom of the gauge push it on the valve and there's your reading. In my image I'd set the Bravo digital pump to 200mb and the gauge is very close to that reading.
Airfloor: The gauge pushes straight into these valves without the adaptor and because of the higher pressure in a matter of a second air leaking past their flap valve registers pressure. In this case my Bravo pump was somewhat randomly set to 720mb and the gauge reads 725mb so near enough.
So the answer is if your Zodiac supplied gauges have NR flaps... and you have the adaptor with crosspiece for the tubes you will get readings correctly shown.
NB: Of course these aren't the pressures I run with but I leave it a bit lower when in the garden in case the sun comes out.