It may be a bad pressure sending unit. Need a little more info on the vehicle that has the problem(year, make, model, engine size etc...).
It is possibly the sending unit or a defective gauge.
A fluid will move from high pressure to low pressure.
Air.
high to low
No, it does not.
A gas or fluid will always move from a high to a low pressure if it can
That's extremely high pressure on the low side. While I believe there's still a good chance that you have an AC problem, I'm more inclined to believe that you have a faulty manifold gauge set than I am to believe your compressor isn't putting any pressure to the high side, and the low side pressure gauge may be faulty, as well. Tools are something where you get what you pay for - if you bought your gauge set at a place like Harbor Freight or Wal Mart, don't be surprised if it's faulty.
a high pressure system moves clockwise, while a low one moves counter clockwise. high pressure systems move down and out, and low pressure systems move in and up.
a high pressure system moves clockwise, while a low one moves counter clockwise. high pressure systems move down and out, and low pressure systems move in and up.
Wind moves from high pressure to low pressure. Air always moves from areas of high pressure to areas of low pressure in an attempt to equalize pressure differences.
In a low-pressure system, air rises and creates a decrease in pressure at the surface, leading to unstable weather conditions like rain and storms. In a high-pressure system, air sinks and creates an increase in pressure at the surface, resulting in stable weather conditions and clear skies.
running 40 mph & jumping high