My new cluster

I came across an si cluster for dirt cheap and picked it up. The only problem is I don't know what year it is. Is there a way to tell? If it turns out to be a 90 or 91 (My hatch is a 89), is there any way to hook it up? Any input is appreciated!

...you'll be able to tell when you try and plug it in...the plugs will be different...you'll be able to use the 90-91, but you'll need a wiring diagram and will have to repin the plugs...

Do you have a wiring diagram, or know where I can get it? Thanks for the info!

:toothless