recently did the swap, I wouldn't plan on a day unless you do a lot of swapping and are familiar with it. has the transmission been rebuilt? Are those axles from a pontiac 6000?
The spacecoast article does a good job of showing how to cut and fabricate the brackets (including the one between the motor and trans). although gotta find the stock brackets. Hardest thing to find is the correct governor. I'm glad I found mine from another member.
there are many articles that show adding the pressure switch and doing various wiring. I only used the two wires that ran the 125, cut the wires and spliced them into the 4T60 connector. colors were even the same, although I don't believe all 4T60 used the same color as the 125. I have the ECM controlling the lock up and it appears to be working just fine.
here is another article to refer to, particularly the wiring you ask about.http://snowcloude.com/~banner/FIERO-4T60.html
1986 Fiero GT Fastback 3.4Lpr with 4T60
1979 Naked Honda Goldwing - sold
1983 Honda Goldwing 1100 Interstate