There is and I have done it with the same setup. I am a diver by trade and I experimented with the same setup. I used a SCUBA bottle and set the regulators with my calibration equipment. I got it to work but it the only value I got from it was knowing that it could be done. The N₂ was expensive, at least compared to air. The SCUBA regulators were expensive and they needed to be precisely set. Calibration is usually not accurate to 1PSI, which you would need. I also didn't want to haul the whole heavy potentially dangerous HP gas setup around with me. 

I dove with He on several occasions. That is even more of a hassle. The whole system would leak no matter what. It was because the Helium molecules are so small they can pass through cracks of pipe fittings no matter how tight the fittings were. 

Is there a way to fill your tires with nitrogen?
When I go back to Zora's Cave, the Queen is gone. I am told that she is out swimming and very late.  I went to the lake and swam around but when I came back, but she is still gone. How can I find her?
