Dwyer has some nice ones, and is a name brand. One popular with the Huky crowd is: Dwyer® 2.5" Low Pressure Gage, LPG5-D8122N, Bottom Connection, 0-15" w.c. (0-3.75 kPa)
The gauge has a bladder inside that can rupture, not a good idea to expose it to high pressures. The only other reason I'd replace one is to have a wider usable scale range. 0-10 kPa gauge on a machine that's tops out at 3kPa for example.