Ok hopefully this cheat guide will help some people out!
ST202 3SGE BEAMS
Light Grey Plug
Red/Black = Engine Warning Light On Dash
Yellow/Black = Oil Light On Dash
Yellow = Charge Warning Light On Dash
Brown = Earth
Red/Blue = 12 Volt To Alternator
Blue/Yellow = Water Temp
Grey = Tacho
Blue/Black = AirFlow Meter On ECU
Red/White = ?
Brown = Goes To Dark Grey Plug
Orange = ELS
White Plug
Orange = SPD (From SPD on ECU)
Purple = ?
Black/Yellow = STA (Start On ECU Where Wire Changes To Black)
Blue = Goes to Injector and Ignitor Wires On ECU
Blue = Goes No Where
Dark Grey Plug
Not Used
ST184 5SFE
White Plug
Black/White = No Where
Pink = Check Engine Light (Warning)
Yellow/Green = Water Temp
Black = Tacho
Yellow/Black = Oil Light
Dark Grey Plug
Brown = Earth
Black/Red = 12 Volt To Alternator
Yellow = Charge Warning Light
Dark Grey Plug On ECU
Blue/White = SPD (To SPD On ECU)
Orange = ELS
5SFE & BEAMS CONNECTIONS
List Of Connections You Need To Make
Speed Sensor
5SFE: Blue/White wire on ECU Dark Grey Plug
BEAMS: Orange Wire on White Plug
Check Engine Light
5SFE: Pink Wire on White Plug
BEAMS: Red/Black Wire on Light Grey Plug
Water Temp
5SFE: Yellow/Green Wire on White Plug
BEAMS: Blue/Yellow Wire on Light Grey Plug
Oil Light
5SFE: Yellow/Black Wire on White Plug
BEAMS: Yellow/Black Wire on Light Grey Plug
12 Volt To Alternator
5SFE: Black/Red Wire on Dark Grey Plug
BEAMS: Red/Blue Wire on Light Grey Plug
Speedo/ELS
5SFE: Orange Wire on ECU Dark Grey Plug
BEAMS: Orange Wire on Light Grey Plug
Now its been over 3 years since I wired this thing up so my current memory is a little sketchy but hopefuly that helps you. I never connected the A/C so if you want aircon you'll have to figure that out yourself I'm afraid.
Below I've also uploaded some PDF documents that I found helpful:
ST184 Wiring Diagrams
SXE10 Wiring Diagrams
ST202 AirCon Diagrams
ST215 Wiring Codes
ST215 Wiring Diagram
ST215 PinOut Guide
The ST215 PinOut Guide actually helped me the most. Some of the colours are not the same as the Red Top ECU but the pins and the function they control are pretty spot on! ENJOY!