Ditto on the Byron conection, a plane ticket and a couple nights in a hotel, and should have all the inverters and or sensors you need to triger the computer(s) to work the dash.
Fan, not so tough, rest of the stuff... I could give ideas, but with no practicle.. BFD..
The problem with the fan is the start-up spike. Same thing we all have with the Mark VIII, Taurus, and or Mustang fans. Fan is something between 30 and 40 amp continuous draw, but start-up spike depending on model can be 50 to 65 amps... even when using the big wire slow blow auto fuse, that spike is more than they can take. Best way for a manual, and in the long run when you feed the ECT back into the ECM and run it off the computer, is to actually run the fan off of a relay, let your manual switch and such simply trip 15 amps to the relay, same as ford did... I would suggest using the Bosh 75 amp relay versus the standard store bought 45 amp ones. Byron's Mark VIII fan write up had part numbers, its searchable on the interweb. Or you can just hit Bosch... and get the part number. Its the same pin placement as the conventional 5 pin relay... just rated for higher flow.
The ECM was programed to trip the fans on at 210 and off at 185, the thing was programed to run through one circuit that had a resistor, and basically a low speed, or switch to an alternate high speed circuit when temps are above (don't know the threshold) and or when the AC is on. AC is wired direct to PCM and back to relay, bypasses the ECT circuit on the engine.
The PCM used the crank position sensor to identify tach output. Problem is it used a square wave signal to ID number 1 for the spark fireing point. That was also the 1 revolution indicator. The MSD is not equiped with a square shutter readout like the Ford distributors before the DIS system.... Figure Byron could come up with a little card that could replace that function, and allow the PCM to talk to the dash module to run the Tach. Perhaps wire to the dash module direct???