Gauge install

[Mv7fd]

I'm looking at installing my AFR meter where my clock is located on my 79 the clock doesn't work anymore and with a radio and cell phone there is no need for one. What would be the best way to install this so I can put the clear plastic and metal piece back over the rest of the gauges and use the factory bezel. Also if I cut into the back of the cluster I believe there is a circuit board there was that part of making the clock work or is it open around where the clock was