I am in the process of reconditioning my gauge cluster on my 89 iroc-z 5.7 with the 145 mph cluster. On the classic industries catalog they have to options.

Option 1:
25081606 - 1986-89 with warning lamps.

Option:2
25081605 - 1986-89 with gauge package.

What do they mean by warning lamps? Is that the same as the hazard lights activated by depressing the button on the steering column?

And what is gauge package?

How do I determine which to buy.

See pic below of the catalog:

 

warning lamps would be oil pressure light and bat. light and what not instead of actual gauges. im pretty sure the 145vs the 85 is just gears inside and not the circuit pad

 

I know for sure I have a printed circuit pad on my gauge cluster.

 

im not saying you dont im saying that the speedo works by gears not the circuit pad, the way i understand what you posted you want option two.
option one is what the base cars have like i said instead of the oil pressure gauge you have it is has a light that comes on when oil pressure is low

 

I would imagine an IROC had the gauge package. The idiot lights came in the base models.

 

I would contact Classic & ask them, since they are the one selling them. Provide them with front & back pics of yours, as well as yours cars equipment info, and see what they say. They may be able to answer it through a phone call or might ask for those pictures to be sure.

 

I will most likely have to contact them to verify the information.