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There are two different answers here: Older cars - an actual oil line from the engine came into the passenger compartment and was attached to a gauge that read "actual" oil pressure in the engine, so it was actual pressure that made the gauge go up and down. Newer cars - a special unit, called a "sender", is mounted on the engine to monitor engine oil pressure. This "sender" will allow more voltage to go through itself the more oil pressure it monitors. The less pressure it monitors the less voltage. The gauge goes up and down depending on the amount of voltage the "sender" is sending to the gauge.
What else can I help you with?
What makes a Chevy cavalier lose its speed and shut off?
you have to eat it and put it in the fridge Check your fuel pressure. Let it idle a little while until it wants to shut down while watching the gauge. The pressure will lower until it don't have pressure to run.
Why does my oil pressure gauge read low?
You will need to remove your oil pressure sending unit and install a mechanical gauge to get a true reading. You need to start out cold and write down the pressure reading and also once it warms up to operating temperature. If the pressure gauge is not the same as the mechanical one you have a bad pressure switch.
Why does your oil pressure gauge drop pressure when coming to a stop?
THAT IS SIMMPEL IT IS THAT URE CAR DONT NEED ALL THAT OIL PRESSURE WEN ITS SLOWING DOWN
What is nominal pressure?
Nominal, in this context, refers to the "face value". So in this case it means what the gauge "face" is indicating. Also called gauge pressure. The difference between nominal pressure and actual pressure depends on whether gauge is a calibrated instrument and is indicating the actual pressure.Nominal pressure means rated pressure, that is a nominal pressure rating applied to vehicle parts.Scroll down to related links and look at "Definition of nominal pressure".
Why when truck warms up oil pressure goes down and to zero at idle but good pressure when cold?
If you have the correct weight oil in the engine, it sounds like the engine may be worn. If you haven't checked the oil pressure with a manual gauge (vs the dash gauge) that is a good place to start to verify that it is not a gauge/sensor problem.
What is the best way to accurately measure and adjust the pressure of a bike tire using a bike tire pressure gauge?
To accurately measure and adjust the pressure of a bike tire using a bike tire pressure gauge, follow these steps: Check the recommended tire pressure range indicated on the tire sidewall or in the bike's manual. Attach the pressure gauge to the valve stem of the tire and press down firmly to get a reading. If the pressure is too low, use a pump to inflate the tire. If it's too high, release some air using the pressure gauge or valve cap. Recheck the pressure with the gauge until it falls within the recommended range.
Why is the pool pressure gauge so high?
Depending on the type of filter it needs to be cleaned or backwashed. Cartridge filter: Hose off. If pressure does not go down buy new cartridges Sand filter: Backwash, if pressure does not go down replace sand DE filter: Backwash, if pressure does not go down remove element from tank and hose off and or acid wash. Also... always make sure you gauge is working
What do scuba divers use to tell how far down they are?
scuba divers use pressure meter because the deeper down you go the more pressure builds upAdditiona depth gauge or a dive computer
Why do your values tap when going on the highway?
What makes you think it's valve noise? How's your oil pressure? If you only have a light, does it flicker or just plain turn on when the engine is hot and idling? If it's an oil pressure gauge, is the oil pressure down near the bottom during idle? If you have poor oil pressure and the engine is making a tapping noise when you accelerate hard, it
What would cause your oil pressure gauge to go down to the red line at idle and back up when driving I'm thinking oil pump oil pressure sensor or the gauge?
sounds like the cam bearings may be going bad
Why does 1994 Buick Lesabre oil pressure gauge go up and down?
The oil pump supplies the oil to the engine bearings where it is forced from one to the other. That is what creates the oil pressure. The pressure is transmitted to the gauge by way of a sending unit. You need a mechanical gauge to see what the true pressure is so as to determine if the sending unit is bad. A defective oil filter relief valve will cause a pressure fluctuation. The pressure will increase from an idle as you accelerate. You will need to check and see what normal operating pressure is and at what RPM.
Why after backwashing your pool does the gauge not go back down?
Your gauge could very well be bad, many pools that we took care of the gauge on the filter was bad, after backwashing the filter just check any of you lines going back to the pool and your should notice the pressure is a lot higher. A lot of people just check the flow by placing there hand at an outlet to check pressure than by walking over too the filter and reading the pressure, instead of buying a new pressure gauge.
