Inflation in kayak?

Just purchased an inflatable seyvorlar kayak, it says to inflate to .9 lbs. pressure, in each chamber. They send a hand pump, which works fine. But no gauge and there is no gauge on the hand pump. I’m wondering how to tell what pressure in in the kayak? I can’t find any info on the company, except they are located in China. Thanks.

You may just want to buy a pump with a gauge. I use this one with my inflatable and have been pleased with it. Advanced Elements Double-Action Hand Pump with Pressure Gauge

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if you are using it under warm condition you better under inflate it , the sun will increase air volume/pressure. on my kayak Neris there is a security valve to avoid problem. You can adapt one most likely