Been looking through this site about intermittent low pressure readings. Have sinced replaced the PCV valve and the pressure sending unit per most advice on here.

After I get everything back together and start it up, it now shows no pressure, and the check gauges light stays on. I added oil, and the stick reads "safe level". It seems to be pumping the oil through the engine, at least the dipstick looks like it. Could my new pressure sending unit be bad? If so, is it bad to drive it until I can replace it tomorrow?
Any help would be greatly appreciated!
Thanks,

2001 SLT 5.9

 

Never mind! Put the old one back in and it works. Must be a bad unit. Amazing how much easier it is to get to the second time around.

 

Always ensure the oil is all the way to the "Full" mark. I understand that "Safe" is safe, however the full marks ensure as much oil can fit in it which ensures the best lubrication and easy pick up. You could also replace the oil filter because if it is plugged or bad element you will get a low oil reading because the sending unit is after the filter. I use Bosch filters.