Installing Tach on a '91 Automatic?

I have a 91 S-10 Blazer (4.3L), and the oil pressure and temp gauges aren't working, so I'm considering replacing the instrument cluster. So heres the question:

Does an automatic s-10 blazer(no tach) have the connection for the tach? Because I'm thinking of getting the instrument cluster with the tach (the cluster that came with the manual s-10 blazer).

Thanks!