The oil sending unit is located on the 1981 Pontiac Bonneville 265 engine is located on the Starter Disable Kit.
it is in the alternator
somewhere on the engine
The 2002 Bonneville with a 3.8l engine has the thermostat in the top radiator hose inlet. A different engine any use a different location.
The 1999 Pontiac Bonneville thermostat is located on the front of the engine, near the bottom. You can follow the top radiator hose from the radiator to the thermostat housing.
behind the driver, under the vehicle.
Yes. It should fit it well.
You can find the PCV valve beneath the MAP sensor located in the plenum at the right front of the engine.
on the bottom side of the engine.
The regulator won't be shown separately on your Pontiac. Most GM vehicles of that vintage had Alternators with built in regulators.
a supercharged muscle car engine
You can find a 2000 Pontiac Bonneville engine diagram at your local General Motors dealerships. Pontiac service manuals will also have the engine diagram and can be found at most local libraries.
Sorry I am not sure how to describe this, but this is a diagram of a Bonneville and its in the exact same location,