Why is my oil pump gauge droppin low when i sit still then when i hit the gas it rises up

1. no year told.
2. no cars engine told, or petro or diesel fuel or what?
   
3. no country told
4. no miles on Odometer told. (a hard case this to do)

oil pressure low , needs to be checked out in a shop! fast.

1. using wrong oil there or is way too low on the dipstick
2. water or coolant in the oil is super bad, looks MILKY
3. gas in the oil ,sniff sniff dip sticks smells of gas/petrol?
4. weak oil pump
5. super worn engine bearings,cam/crank/rods.
6. bad defective oil sender we test pressure with a real gauge 1st.
7. OMG oil filter fell off or loose is oil leaking to the ground?
8. on old cars we check engine oil level every fuel fill up.. or fail.

If it is a manual system--sounds like coolant low ie: air bubble in system. If it is ATC system, Check Codes, if no failure codes, coolant may be low--air bubble in system--most Durango's have air bleeders in system.

This could be worn bottom end bearings, a worn oil pump, a weakened oil pressure relief spring, or a faulty gauge. I once saw a Landcruiser with a faulty gauge.

Get another good gauge into the oil pressure port as a first step. If it gives the same low reading try a temporary fill of thicker engine oil. If this causes the reading to rise, it is probably worn bottom end bearings, not unusual in a 95 model.

After that you will need to inspect the oil pump.

check the wiring on the sender unit , ground wire for good connection it masy be a gauge and resistor problem but I suspect it is in the wiring or the sender unit at the tank

pressure release on oil pump faulty

That is a good sign, it is working, my oil pressure fluctuates like a tachometer, at idle it is low, like 20 lbs, then when I 'm cruising, 35lbs, but it goes up and down when you pump the gas. The pressure gauge is reading the oil pressure at the top of the engine, it will show 45 lbs with only 1 qt of oil in there, it is not an oil level gauge. You might have an oil light buried on the dash somewhere that will light up if the oil gets too low. ,, Now about that coolant leak, it should have nothing to do with the oil pressure. Is it a hose? Radiator? Joint at the top of the engine? Where is it leaking, and what is it doing? Does it over heat? Or did it overheat? Is there oil floating at the top of the radiator? Does it blow steam out the exhaust? Does it have coolant or just water? Check it out. hope this helps.

It sounds like most likely its your Oil pump, if you have no pressure at stop and when you hit gas it sets the C/E light off, Guages in dash wont set off Check Engine Light. Replace Oil Pump.

I would start by replacing the oil pressure sensor. If that doesn't fix the problem, replace the oil pump. Its possible that the oil ports are partially clogged. If replacing sensor and pump do not fix the problem, you may want to try to flush the engine with an approved cleaner

the fuel level sending unit might be shot. mine went out and every time the gauge hit 1/4 tank the needle dropped. its a $80 part, simple to fix yourself if you are out of warranty otherwise they will try to nab i with a $280 bill that includes changing the fuel pump which is not required.

You either have a loose/worn engine bearing or a worn out oil pump, do not drive the car this way, you will cause serious damage to the whole engine. A oil switch is for a light, it turns on the light when oil pressure falls below about 10 PSI, a sending unit is for a guage that shows oil pressure with a scale, it may have numbers on the guage or just green and red, or high and low.