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So that they can ascertain the pressures in their vehicles tires to ensure their vehicle is safe to drive.
Your pressure gauge may be broken....If it fluctuates, then you know its not your gauge, but if your gauge always reads 80, it may need to be replaced.
To Test the Tire pressure on a vehicle
These will be the coolant temperature gauge, oil pressure gauge, and battery voltage gauge.
Either the gauge or the gauge's sensor is broke. Has the oil & filter been changed in the vehicle lately?
If you drive the car 10 miles, and it doesn't move.
To give the operator of the vehicle a real time and accurate check on the oil pressure of the engine.
if you are talking about the pressure Gauge it is becouse your car is bumpy or you drive too fast
Put a high pressure gauge within the range of circuit pressure in the pump circuit. Lock the final drive sprocket against the frame so that it can't move. Actuate the travel lever and record the reading on the gauge.
This is a pressure sensitive switch that controls the oil pressure indicator (light or gauge) on the dash board in the vehicle
Drive and see how long it lasts.
A pressure gauge indicates actual pressure and a differential pressure gauge indicates the difference in pressure.