When driving the oil pressure is fine, but when the car is at normal temp. and I have to stop for a light, the oil pressure gauge drops until the 'Check Gauge' light comes on, the car runs fine, no erratic behavior and then when I put my foot on the gas, the oil pressure goes back up to normal. I have replaced the oil sending unit twice, dropped the oil pan and put in a new oil pump and filter, cleaned oil pan and replaced everything I could think of and also had a mechanic put a manual oil pressure gauge and he said the pressure was fine,no knocking .... I'm stumped so I thought I would ask the 'Pros' .... you guys, any clues ...? Could it be the oil pressure gauge? If so, I would have to replace the entire cluster of gauges as they are not able to be installed separately.
Thanks in advance for any replies and all the best ....