Speedo Part # Location?

Where are the part #'s on Speedometers and Tachometers. I bought a dash pad from a guy and it has them in it, but I don't know where the #'s are to check in my interchange book.

Lonnie

One of the Speedometers I have has Kilometers on the inside ring. I don't think this is from a 72. My car is a 72 LS5. 454 auto with a/c. maybe someone can tell me what the redline on the tach is supposed to be and info on the speedo. I'm getting ready to send these of to be refurbed as soon as I know which ones to send.

According to the Black Book, 75 was the first year for the kilometer-per-hour subface.