Here's a cheap way to get a couple of clocks into the sim. I'm using Sim-A software to drive the display but you could use PM or Flightdeck Software. You might also use PMDG and drag the clock gauge to the screen if you had enough video outputs from your FS computer. It will require a separate video output to drive the screen of course.
I purchased the 3.5" LCD off ebay for around $30AUD plus the VGA to Composite adapter to drive it at about $30AUD making for a cheap $60 clock.
Ken.