When I did my turbo swap years ago this the what I used for my wiring
You need to get a Haynes manual for ’79 to ’83 280ZX. This is the one with
the red cover. Look on page 252, this is the wiring diagram. You will see
3 plugs labeled “1,2,3” with circles around the numbers. This is at the
lower left-hand side of the page.
The wires are as follows:
Plug 1= BR 12v power source. Positive
G 12v power source. Positive
Plug 2=Y start signal (+)
GL ground for inhibitor switch
YW speed sensor (not necessary)
Y A/C signal (+)
YW coil (-)
B fuel pump ground if using modulator
Plug 3=LR fuel pump relay
G ignition .signal (+) for air regulator
W not used
Y not used
BW ignition signal (+)