Since you know where the sender is on the engine, Get a manual test gauge and put in on and see what the real pressure is before you do anything else.
SOURCE: 1992 buick park avenue divetrain problem
With your transmission warm and your car running. Check your fluid level. With that amount of Km, it most likely needs serviced and the bands tighten. There are some additives on the market that will give you a little longer life. You may want to try some of them.
SOURCE: Oil Pressure Gauge
It's not uncommon for a new part to be defective. While the car is running it should be in the middle. If you have the ignition on without the motor running it should be at zero. If it isn't, you definitely have a problem. There is a solder joint that in the guage cluster that will losen up over time causing incorrect readings on the gauges. Also check out the wiring going to the sensor for frays. This can ground out the sensor giving inaccurate readings.
SOURCE: I found neddle bearings in my sump of my 4d56t
does the engine knock when you start to pull hard ?
SOURCE: my 1992 buick park avenue backfires and will not start
one of the wires on coil pack is wrong..
SOURCE: Buick Park Avenue Security System
I've got my own one stuck for weeks and this was the only thing that brought it to life again : http://newrockies.ca/vatsbypass
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