The amazing thing is that, if it is a new tank, there will be
instrctions included *that say to pre-charge it to the system pressure
and the thread should have been unnecessary.

Harry K

While true Harry... the reason for this thread was two questions that
I as a non plumbing professional posted

"My questions:
Do I just add more air to get to 80 PSI?
Is a small electric tire compressor ok or must it be a hand/tire
pump?"