On the engine block, passenger end, inboard side (the side closest to the firewall), just above the oil pan. If you remove the front wheel, passenger side and look through the opening in the wheel well you can see it and gain access to it easily.
A 1992 LeSabre wouldn't have a valet switch
The oil pressure sending unit on a 1997 Buick LeSabre is located on the bottom side of the engine, near the oil filter. It monitors oil pressure to ensure that the pump is working properly.
Buick does not use a reset switch.
On the transmission
GM vehicles do not have an inertia switch.
No it does not.
GM vehicles do not have an inertia switch.
33 psi
30LBS in each tire.
40-47psi
Manifold Absolute Pressure/Barometric Pressure Sensor
Should be located on the brake pedal arm near the point at which the arm connects to the dash. If it has a pressure switch, it will be located near the Master Cylinder.