My oil pressure gauge likes to do its own thing it will work sometime and others it will do what it wants to, won't read, bounce around etc etc.could any one help? Oh its a 1991 z28 if that matter's about anything

 

I know absolutely nothing about how the gauges even work, but it'd be a good idea to check the obvious first. Maybe check behind the gauges, see if any cables or wires are lose.

 

Check the wires going to the Oil Pressure Sending Unit - it should be located just above your oil filter - there are 3 wires, two are larger, they run the fuel pump - the smaller one operates the guage.

 

alright thanks for the help

 

hey i was having the same problem - except i drive a 4bbl trans am

i had a friend install a new sending unit (so i dunno where it is) and it seemed to be working fine and it just crapped out on me one day.

it rests at the bottom, but when i turn the car on it flips all the way to the other side at full pressure and stays there

and ideas?

any and all help would be appreciated!

 

If it pops out for some reason it will do it. I know that if a wire melts and grounds out it'll do that. hope that's a start. I'm not sure about the lg4 being the same, but I think it connects to a fitting up top in the back of the motor.

 

does anyone know where the sending unit is?

that was i can find it and run through all the wires

thanks!

 

For your car I believe that its behind the intake manifold. Look to the right of your distributor, it should be a cylindrical metal thing, with a wire on the end of it.

 

Would the SES light come on if the sending unit were faulty? That is, the computer would sense it and throw the light. If no light, then perhaps the gauge itself isn't plugged in correctly or is the culprit.

 

I had to replace my sending unit last year. I hope you got small hands.

 

I don't think a bad sending unit will trigger an SES light - I've never seen mine go on because of a bad OPSU.