So the oil gage on your car...

Question

is it for the amount in car, or is it the pressure of the oil?

I have no idea

Answer 1

It's for oil pressure.  If the light comes on while the engine is running, you have lost oil pressure.  This would be because probably the oil level is low and has allowed the engine to suck air into the oil pickup tube.  This can ruin your engine if you continue to run the engine if the light stays on.

Answer 2

Oil pressure

Answer 3

depends is it a H-L gauge  or a 0-180 gauge