When you get snakebite it's too low
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-read the tire-it will probably have 2 numbers, stay above the lowest?
My 2.10 front xc tire reads 40-60 psi -250-400 kp.
I did it by feel 'psssssst' and I'm a light rider so I can probably go lower. I don't have a guage either.
Probably when we had ice roads, I was lower than 40, Lowest I remember the guage @ the gas station was 215 kp. And I may have pfffffffffffted some more .