Hi David,
Just coming over from your other thread,
the easiest way is to put the car through on Sierra CVH on pre 92 emissions then you can easily upgrade to new Zetec and they don't know any different. I went that route originally and Mark, on here, has just passed on the same. You're upto 170bhp for the easiest and cheapest route possible.
If you're passing i'll take you out in the Saturn Car which is 2.0l Zetec on bike carbs and MegaJolt.
Just installed a full new electronic dash aswell and need to get out to test it anyway.
Mark if you are reading this i'm ready to borrow your gps to calibrate the speedo.......
Cheers.....AndyH