For my 1987 f250 when I turn shows low engine oil pressure and after a few minutes down to zero and goes?
Hello everyone I have a 1987 ford f250 to which he did oil changes and filters a few months ago to take my little work and after about 20 minutes this will be under pressure from oil and I will turn off the turn and went back to take her home when I saw k reaches the needle down to zero and let it cool for three or four hours turned to light went off and saw the needle was Low oil and 15 minutes under zero and turn off anyone have any idea what happens Nose heated ninada my truck is only low pressure and I can do to fix it
I realize English may be a 2nd language, but I'm not confident enough in what you're asking to give you a good answer, sorry.
Hope you'll understand what I explained about the F150: The oil pressure gauge sending unit is most likely the problem on your truck. You'll need to connect a mechanical gauge to the place of the old sending unit to check for the true pressure reading.
Low oil pressure readings could be attributed to internal component wear, pump related problems, a low oil level, or oil viscosity that is too low. High oil pressure readings could be caused by an overfilled crankcase, too high of an oil viscosity or a faulty pressure relief valve.
The oil pressure sending unit is a variable resistance type magnetic unit that works in conjunction with the magnetic operation of the gauge system.
The sensing unit may only be tested for operation. There's no calibration, adjustment or maintenance required.
Note: The pressure switch used with the oil pressure warning light is not interchangeable with the sending unit used with the oil pressure gauge. If the incorrect part is installed the oil pressure indicating system will be inoperative and the sending unit or gauge will be damaged. 
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