Dude the trip computer mod is dead easy to do, if you are prepared to crack open that dash again!!!.......
Mattis Modifications webpage (Xyphoid) has all the instructions that you will need and they are very easy to follow, as long as you follow them carefully.
Here is the address (as if the people who use this forum dont already know it :-)
I picked up my trip computer for $70 bucks - Ford sell them for $300 or something stupid like that
The only problem I ran into was that with the engine running and the headlights on, the trip computer flickered like crazy, this drove me nuts but I came up with a educated guess to fix it.
On the Connecter that connects to the trip computer, I cut the wire to pin 5 (LCD dimmer signal), Worked perfectly.. (and still dims like its supposed to as well)
Of course if you do the mod and it doesnt flicker for you, even better :-)