If you have been using a cheap oil, stop. A faulty oil pressure sending unit can result in inaccurate oil pressure readings and warnings. Fungsi Dan Cara Kerja Oil Pressure Sensor Sensor Tekanan Oli Serta Gejala Kerusakannya - Lks Otomotif Cold weather can also make the oil pressure read low until the oil pump has had a chance to deliver the oil to the engine. Oil pressure gauge not working after oil change . I removed the two screws at the top of the plastic bezel around instrument panel but it will not pop off. You will also need an oil pan gasket set. I changed the oil/filter/sending unit and once again everything ran at my accustomed oil pressure reading in dash. Oil pressure gauge not working: Bought oil and parts for about£100. 47 ohms is approx 90 psi, 100 ohms is approx 70 psi. Obviously the oil pressure sending unit is related to the problem as it temporarily solves it. Not a sludge problem,checked with manual gauge and had 40 psi.also oil runs out when i...