? pressure gauge

["Paul Dorsey" <dorpaul@negia.net>]

Hi,
I work at the local Habitat for Humanity Thrift Store.  We were donated a
(science?) gauge which measures pressure in mm of hg.  By blowing on the tube
with my mouth, I can get the gauge to read almost 100, however, it's scale
goes to 600 mm of hg.  This instrument looks useful, but, is oil pressure
measured with the same type gauge/scale?  Would it be useful elsewhere on our
cars?  Or in our workshops?

Thanks,
60 TR3