I bought a digital gauge at Lowes yesterday, after getting sick of using the stick gauges, or the gauge on my air compressor (weird fluctuation with the readings).
Good thing is, it is very consistent, easy to read (obviously, digital) and seems to be accurate. My stick gauge, air compressor and the digital all read about the same PSI... The digital is just much easier to work with.
It was only $9, it is the "Slime" brand they sell.
I recommend it! For the price, its a good value IMO.