Originally Posted by Rootman

I use what's on the pump or my compressor. As stated it does not make a whole lot of difference. Since bike tires are thin and small the pressure will change with temps and time more than a cars will.

Most gauges I've tried have been fairly accurate. I carry a fairly large foot pump in my rack bag because I have larger tires, and a bad track record with flats. Once I was on my only spare tube of a ride and had to stop 6 times to air up. The patch wouldn't seal on the first tube, a failure around the valve stem. My wife is not very good at navigating so I carry a bunch of stuff, tools, pump, tube, etc. to help make sure I can return home. A hand pump just takes too long so I got the smallest foot pump I could find. And as long as the gauge is fairly accurate it's close enough for me.