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Sounds more difficult than it really is....I did not do this myself but have had friends who did with great success. reason for doing this is sometimes you come across a motor from a DIGI 1 car and want to put it into your DIGI 2 run vehicle and theres no wiring harness provided and they are getting hard to find in salvage yards with all the proper wires unmolested..or you just dont like chasing wires and pulling them from behind the fuse panel...

The first thing we need to do is pull the plastic cover off the the back of the plug that goes on the ECU and slide it as far away as possible.Then we need to pry the the two peice plug apart with a screw driver or knife.With a very small screwdriver you will then be able to swap some wires around on the plug.
Pin # 21 needs to be moved to #5 on the plug The wire that is in pin #5 gets soldered to pin #7 wire.Pin #17 gets moved to pin #15(full throttle switch).You need a jumper wire from #14 to #23.Pin#21 gets swapped to pin#20 on the plug.
Now you need two 3 wire plugs(one for throttle switch and one for the air temp sensor).You will also need some 3 wire throttle switches.
Now we need to chop off the airflow meter and throttle switches plugs.pull the #17 bl/bk wire and tape those to the existing throttle switch wires.This is pin#1 on the 3 wire plug for the new throttle switch plug.The br/w wire(pin 6 on ECU)is pin#2 on the new throttle switch.The r/bl wire(pin#11 on ECU)is pin#3 on the new throttle switch.
The bl/w wire from the old airflow meter plug(#9 on ECU) is now the new pin #2 on the air temp sensor plugThe bl/r wire(old airflow meter wire)needs to be soldered to pin #1 on the new air temp sensor(the wire that was moved from pin #21 to #5).The br/w wire from the old airflow meter(#6 at ECU)is pin #3 on the new air temp plug.
Now we need to bridge pin #6 and pin#1 on the ignition control unit(you don't need this unit for the G60).
It sounds very complicated,its not.

The following wiring diagrams are unverified.

1 Start (50) red/green
2 OXS purple
3 Fuel pump relay red/green or yellow/blue
4 Knock sensor white
5 CO Adjustment blue
6 Ground (Sensors)
throttle switches
Hall sensor
Coolant temp.
CO pot/Air temp. --- brown/white

7 Knock sensor brown or yellow in shielded black cable
8 Hall sensor red/black
9 Air temp sensor blue/white
10 Coolant temp sensor brown/green
11 Idle Switch red/blue
12 Injectors red
13* Ground ECU brown
14 Power main / Idle stab. valve black/white
15 Full Throttle Switch blue/black
16 not used
17 Not used
18 Hall sensor green/white
19 Ground brown
20 MIL yellow - Yes This is the wire the bling bling blinks the fault codes off your eprom! You did know that your ecu stores sensor fault codes?
21 Not used
22 Idle stab. valve black/yellow
23 Not used
24 Not used
25 Ignition coil green

and here is a huge wiring diagram for you to download (i'm not posting it cause that would be obnoxious)
right click to "save picture as" to view it full size, or "open link in new window"

good luck.
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