Quartz Clock Install ?

[Ironhorse]

This has probably been covered before but had no luck with a search question. I found a quartz clock in a salvage yard for $10 from an 86 'Burb complete with the wire harness. Two wires which I would imagine one (orange colored) being power and other (black) ground. Did not have time to pull it then, going back tomorrow to get it. Any one have any specific information or tips on what is required to install in my dash bezel? I put a factory tach in last fall and it works great. I think the quartz clock would be kind of cool to fill that remaining hole in the bezel. Any tips or ideas for the install would be appreciated, pics of the back side mounting would be great. Thanks in advance to all who reply.