1) Yes, late cars have switches moving horizontally
2) Layout you state is correct (it never changed ,thru production) - Add Speedo left of column, tach on right.
3) Switch 1 is a rheostat, Switch no2 for Lights is 2 pos, all other are single throw.
4) see above
5) no plain switch, I have a few
5) Engine compartment light (and frunk) is the same as dome light but has a thumb wheel to turn on/off.
for reference info ; dashboard switches decals | The De Tomaso Forums (infopop.cc)