I did have a look at it, and did my best work out which wires in my harness did what - although my total colour blindness is a *slight* problem there

From what I could see, the connector for the standard clock is the same shape size as that for the trip computer, although there were definitely a few wires missing - from what I remember they were the ones from the Auxillary unit and should be an ouput from the trip computer, not an input - I've certainly seen cars with trip computers and not AWS, so it should be doable.
I'm almost certain that the feed from the Vehicle Speed Sensor was there, as was the feed from the fuel tank sender unit, so most of the 'important' stuff, i.e. instantaneous mpg, estimated range etc should work. Outside temperature feed was missing though . .
What I wanted to do was try a unit in my car before investing in one from Ford, but my intended source - one of the hire cars we use at work - was replaced by a new shape Mondeo before I had a chance - Doh !
If anyone could confirm that it can be retro-fitted, I would be very grateful.
Regards
Shawn