Other than the 1987 and 1988 Eurosport VR versions I am unaware of any Chevy Celebrity with cup holders.
The petcock on a 1989 Chevy Celebrity is at the bottom of the radiator on the drivers side.
The oxygen sensor on a 1989 Chevy Celebrity is located in the rear exhaust manifold on top about the center.
The 1989 Chevy Celebrity V6 is rated at 130 hp.
The spark plug gap for your 1989 Chevy Celebrity 2.8 V6 is .045".
Looking in my factory service manual for a 1989 Chevy Celebrity I found no reference to an accessory relay.
There is no fuse on the alternator.
on the side of the transmission
The thermostat on a 1989 Chevy Celebrity is located under the water outlet fitting. Follow the upper radiator hose, it will end at the water outlet.
No Chevy Celebrity ever had a 4.0L engine
All Chevy Celebrities have rack and pinion steering.
On a 1989 Chevy Celebrity the timing is controlled by the engine control module, there is no specification or provision for adjusting the timing manually.
Which engine does your car have?