My 2003 trailblazer's oil pressure sending unit is past the highest pressure point of 80.... Is this the sending unit are the gauge in the dash??

The sending unit is a variable resistor. When the oil pressure is normal only a small amount of voltage goes to ground through the sending unit. As the oil pressure goes down, more voltage is shunted to ground reducing the sending unit voltage and causing the gauge to indicate a lower pressure. If the oil pressure falls very low or disappears the sending unit shunts all the voltage to ground which causes the dash indicator to show no oil pressure.
Now if the wire to the sending unit gets nicked, melted or cut and finds a short circuit to ground, or gets disconnected in a junction point between the gauge and the sending unit, you will get the same no oil pressure indication from the gauge.
Check you wiring for a short to ground or an open connection.
The same

because your oil pressure rises to around 40psi when running and will leak at the weakest place,check your oil sending unit first and seals.






Tim

Change oil pressure sending unit. This should clear your problem up. If you need assistance for removal and install I will be glad to help.

The oil sending unit is located on the engine block behind the drivers cylinder head area.You have to climb up on the motor to see it cause it is hard to see behind the wiring harness.You may also want to purchase a new sending unit because it is very long and you might need to buy the sending unit socket to replace it.Hope this helps.Good luck.

You probably need a oil pressure sending unit it is located at the back of the engine and is a high failure

Could be either a gauge gone bad, or the sending unit. Unplug the oil sending unit with key on to see what the gauge does.

no this sounds like a defective gauge, a sending unit cause this symptom

your oil sending unit is bad, replace the sending unit and should fix it, the unit shorts out and maxes out the gauge, hope to help you,

the oil pressure is always high when you start it,the oil is cold and creates a different reading.
a few things...to consider
oil pressure sender defective
too much oil
wrong oil type

now unless there is a very loud knocking of the motor which would mean that the engine's top end was not getting any oil I would say that your oil guage is sprung and needs replacing. a high pressure rating would indicate a restriction in the oil flow pasdt the sending unit or a plugged oil filter. if the filter were plugged you would know it because your enging would run tight in no time at all. replace the guage itself... please rate this........thanks