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My horn unit was rusty and had to be replaced.
The 1986 Chevrolet Cavalier oil pressure sending unit can be found on the left-hand side of the engine. The oil pressure sending unit will be above the oil pan.
The fuel sending unit for the fuel gauge would be located in the fuel tank.
The 1988 Chevrolet Camaro signal flasher unit is located beneath the drivers side dashboard. The signal flasher unit will be to the right of the brake pedal.
under the altenator behind the passenger side tire
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.
The oil sending unit for a 1998 Buick Ultra is located on the front of the engine, below the power steering unit. Remove the plug from the sensor, and unscrew it from the block to remove and replace it.
The temperature sending unit on a 96 cavalier is on the front of the engine. It is just to the left of the alternator.
First try unplugging the coolant temp. sending unit and plugging it back in(may just be bad connection at the plug), next replace the temp. sending unit if the plug-in thing didn't work.
It is towards the front of the engine lower side between the starter and AC compressor. Sticks out about 2 inches from engine.
Cavalier 1985-93 Top of Glove Compartment
The oil sending unit on a 1995 Cavalier is on the passenger side of the engine. It is close to the oil filter, screwed into the block.