Not looking for an argument or to derail the thread, but I strongly disagree with the recommendation for that $300 digital gauge. The other 'gauge' linked was the same air pump as the first link. Since bike tires are relatively low volume, you're going to lose quite a bit of pressure just by attaching the hose. You would have to put an extra 10-20 psi in the tire before you attach that gauge to ultimately get the numbers you want. Maybe even more. Kind of the same concept as attaching a suspension pump to your mt. bike and 'seeing' the pressure a lot lower than where you started; it's due to the hose being filled with air from the tire. While we might all be playing with different definitions of accurate, pumps tend to be more accurate at higher pressures vs. lower pressures so a gauge may not be necessary for road tires. The ST crowd seems to like to go beyond that though. I would recommend the ~$25 SKS airchecker. I have the Topeak Smartgauge D2 as well, but don't like that it doesn't go down to 0.5 psi increments. You can bleed from the SKS with the orange button, but the attachment/removal process only loses ~1.0 psi each time when playing around with low volume tires at 90+ psi. It's easier to do it that way (1 handed) than fart around with a bleed button. Then you (not directly you) have $275 laying around as a down payment on a trainer desk/tray.

I can't comment on the gauge accuracy of the Specialized pump, but my friend has it and I think it's a great option for the size when the Jeep was packed full of our CX crap. I had no idea it was $100 though! I would just throw a few pumps in and then use my gauge, but it was pretty strong for how small it was.