1997 Kenworth T800 with n14 red top

I think the 14 sensor was around the oil filter housing, but it's been a minute since I looked at one.

Should be a 2 wire plug. Roughly, unplug the sensor with the key on. Check DC volts across the 2 pins of the harness. There should be 5ish volts. 4.5-5.5.

If the voltage is good and female terminals of the connector are good, I'd replace the sensor.

 

Check the oil rail down the left side of the block too, I can’t remember where the sending unit is, but, there are multiple ports along the rail. Be just below the fuel pump front to back. I have a fitting in one of the ports to pressurize the oil system after having any of the bottom end loose….

 

Just looked at an old N14 I have here, there is 6 ports along that rail. Easy to identify since the line from the oil pump goes into the front one….