cool =\= functional.
the led ones are kewl, but I don´t think I would ever put one in as a
replacement for the needle-style tach. I would probably only stick in somewhere flashy just for looks, because you really can´t use an led style tach unless you´ve got like 500 leds, because the incriments on those things are like 500rpm, and that really isn´t accurate enough for really intenst driving when you need quick sighting of where you are and where you´re going.
I´m not sure exactly what gauges you can throw in there, but it´s gotta be possible to take a 2nd gen tach from a GT or an LX or whatnot (they use the same tach) and then just re-wire it. Ford really hasn´t changed the skeleton of the design in the newer models, only the look.
So if you want, pick up a 2nd gen tach from the boneyard (usually can be had for 5-10 bucks) and then find the signal, ground, and 12V lead, do a little thinking, and hook it up and see if you get a reading. If you do, then CUT the acrylic of the gauge to fit.
Essentially, the gauges are the same. The thing that makes it look big is the fact that you´ve got a huge faceplate, but that can be eaisly cut to fit your gauge cluster.
Then, I can send you the faces in a PSD file, you can modify them fairly eaisly, then print them out and you´ve got a custom jobbie. Would probably take an afternoon of work, but it´s more than possible if you´ve got the time.
Although, if you want, just get a sunpro and mount it up on the dash. I wouldn´t mind having my stock tach up there, because sometimes when I´m hammering through turns, the last thing I want to do is take my eyes off the road to read the tach, and little things like that make a big difference.
However, please don´t go the ricey route. Something like an autometer 3.5" tach would be more than enough for the job and would give you the speed and accuracy you want. However, you should probably take the stock gauge out or at elast disconnect it, because you may have trouble with signal loss in the tach signal wire if you split it to the two tachs simultaneously and get a low rpm reading.