The ecu harness side of the 87 b38 connector (10 slot, 5x5) connections are as follows, catch up, 1-5 top row, 6-10 bottom row: (the number, like 2 or 1.25, in front of the letter color code are the xsect area of the conductor, the bigger the fatter)

1> empty and not used
2> 2BY (fat black yellow stripe #2) ground this terminal for m/t and wire to NSS in a/t
3> 1.25B (med fat black) constant 12v+ from battery
4> 2L (fat blue) wire to 12v+ ign. on
5> epmty and not used
6> LgB (Light Green with black stripe avg size) nice but not necessary - can hook to reed switch in speedo or 4wd light controller end of same wire
7> YG (yellow green stripe) not used in transplant-fake boost gauge wire
8> empty and not used
9> 2BY (fat black yellow stripe #1) wire to 12v+ ign start position
10> BR (avg black with red stripe) ecu codes output wire - extend to within easy inside the cab reach and read with a circuit tester light for codes 1 to 6.

Not responsible for advice not taken...