I have a set of gauges in my 82 cabby. One if the damn things say "BARS" what the hell is that. I think it is for vacuum but I don't know. Please help me!!!

I have an 82 Rabbit Conv., and the three gauges located below the radio are Battery level, Oil Pressure, and Oil Temp.
I hope that helps.

bar is a metric unit of pressure. The gauge that says bars is your oil pressure gauge. 1 bar = 15 psi