I have 3 60 lb gauges

a $35 "racer" gauge (longacre I think)
a $15 Brookstone
and a $7 digital from Radio Shack

All three read exactly the same to the 1/2 pound (the resolution on the digital).
The Longacre is a bit more sensitive as you set to 1/4 pound with it. Although my butt isn't sensitive enough to detect a 1/4 pound difference (or 1/2 pound for that matter).

I like the digital as it's easier for my old eyes to read. But it's harder to set pressures since it has no bleed down.

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Spec RX7 #11
Scottsdale AZ