I've given up on gauges! I simply inflate my tire and pinch the sidewalls, if the tire gives slightly, I'm cool with it. You can always use a gauge and pump up the tires to 120 PSI and follow this by feeling how much tension the tire has on the sidewall by again by pinching the side walls. I purposely don't pump my tires to the extreme, where there is absolutely no give to the sidewall. I am afraid of the tire bursting or blowing out!!
Floor pumps these days are amazing! Nothing like the one's of old where you'd be on your third stroke and the air leaking out of the hose would be on its second! I can pump up my tires in seconds and be on my way. Good luck!!
And delicately using a regular screw driver one can change a tire! Nice thing about a screw driver is that it doesn't break as easily as a plastic tire iron! (oxymoron: plastic tire iron!) Tire irons are ideal though for a tire change!!!