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The oil pressure sending switch on a 1988 Chevrolet Celebrity with 2.8L V6 is located on the bottom of the block near the oil filter.
Chevrolet Celebrity was created in 1982.
5W30 weight
I found one source that says a 1986 Chevy Celebrity has a curb weight of 2714 pounds. Different options would change that weight.
If your Celebrity has the 2.5L 4 cylinder engine the oil sending unit is on the side of the block below the intake manifold. If your Celebrity has the 2.8L V6 the oil sending unit is on the lower side of the block next to the oil filter.
I changed my oil today, the drain plug is 15 mm.
I found a site that listed the curb weight of a 1989 Chevy Celebrity at 3100 pounds. Of course that would vary depending on the engine and other options on a given car.
It is GL-5 and the weight is 80/90 gear oil.
Use SF quality oil or better. Viscosity should be appropriate for the climate you are in.
5/30 it should say on your oil cap
SAE 5W30
I would suspect excessively worn or broken rings.