oil pressure

[81DIESEL84]

I changed the oil two days ago and now the truck has very little oil pressure closer to zero like 2psi. i put 15-40 rotella is it the sensor or gauge or the oil. where is the sensor located

[Robyn]

Sensor is on the back of the engine behind the LH head.

What was the pressure before oil change???

Changing the oil should not effect things.

Missy