9.5-16 R-1 rear tractor tires, Calcium filled. I want them at 20 PSI.

[PILOON]

Heck those 'pop out gauges' are so cheap just have a few on hand.
Even if not dead on accurate the readings will confirm that both tires are equally inflated.

LOL, now if it were aviation the gauges would need annual calibration and be certified.

 

[Sawyer Rob]

I went to my CIH dealer and bought a tire gauge made to use with tires with cal. in them...

That's what I use and it's been working fine for several years now...

SR