Old thread I know.
Just thought I'd add that I found a connector behind the radio for the clock/cubby.
Mine didn't have all the wires attached, but the power wires were all in the correct place so I just plugged it in.
Only the clock was working though. Nothing happens when the display button is pressed. I've never seen it working in a original car to see what i'm missing out on.
I'm fine for now since my speedo gauge cluster already has temperature and fuel info on it.
First picture is where I found the connector. Cable tied to the radio loom.
Second and third picture it the differences between the 2 plugs, the left plug being the one that came with the clock, and the right one is part of the existing loom.