What's in, Hg, VAC on the R134 air conditioner pressure gauge?
In Hg: British pressure unit. Generally used in negative pressure (vacuum) pressure indication. Is a way of expressing air pressureThe in.hg represents the inch pressure value, the same as the usual cm.hg indicating centimeter Hg height.
In.hg stands for inches in mercury, and cm.hg stands for centimeter hg. VAC - vacuum
R134: refrigerant for automotive air conditioning.In Hg: Inch mercury column, pressure unit. 1In Hg=25.33 mm HgVAC:VAC - vacuum warning lights, often used in cars
