[DeTomaso] Euro Oil Pressure Gauge

[Tom Shinrock]

 I have a Euro car with an oil pressure gauge labeled "PRESS. OLIO" that has five tick marks at 10:00, 11:00, 12:00, 1:00 and 2:00.  The first tick mark at 10:00 is labeled "0", the third tick mark at 12:00 is labeled "25" and the last tick mark at 2:00 is labeled "50"  The tick marks at 11:00 and 1:00 are unlabeled but I assume represent the half way point between "0" and "25" and "25 and "50".  

What are the units of measure that the gauge is indicating?   I'm curious to know what my oil pressure is.  The needle will point to the tick mark at 1:00 at start up and move down to the tick mark labeled "25" when the motor is hot.

Tom