Hi Oil Pressure

Rocky at RockyLaRochelledotcom did pass the time by typing:

I used a NAPA part, ECH OP6695 on my 93

Couple of questions.

did you put any thread tape on the thread and if so did you only put it on the back few threads? The sensor needs a ground through the fitting.

How does the wire look, is it corroded?

A short causes 0 psi, the sensor uses chassis ground.

Take a resistor (2-40 ohms or close) and connect that between the sensor plug and the engine block/frame.

You can also use an ohmmeter to measure the sensor directly. Could be you got a dud. :/

Check the service manual,by using the key you can put gages in diagnostic mode, your gage will show 0/40/60/80/60/40/0. Lets you know the dask is OK. Next disconnect sensor turn key on/engine off. Does it stay at 0? Do you have a 3 wire sensor connector? The PCM sends out 5v and depending on what is passed thru the sensor (5v-3v-0v)is what is sent to the dash. There is also a ground wire that is sharred by other gauges,if they are working fine the oil ground should be OK. The 99s are set up like this not sure if yours is. Also do you have a tilt steering wheel?

That means an open circuit. Like Doug mentioned, some folks use teflon tape on the threads which 'can' interfere with the sensor's ground. The tape slides out of the way in a perfect world or bunches up and messes with the contact other times. Lots of sensors you buy warn about this on the package. If you are going to use a thread lubricant, pipe dope or loctite are the best for sensors.

I would try grounding the plug to see if the gauge comes down to 0. If not then I would be looking for a break in the wire or be suspecting the gauge got unplugged. Has anyone been messing with the radio or stereo?

Mike