this might help mate.
WIRE COLOUR/S Function
Red/ Blue (Permanent +ve) (Thick Wire)
or 2 black wires on a 3 Door Engine loom
Black (Ignition +ve) (Thick Wire)
Black/ Red (Fuel Pump Feed) (Thick Wire)
Green (Rev Counter Trigger)
Brown/ White (Temperature Sender)
Brown/ Green (Oil Pressure Sender)
Brown/ Red (Engine Management warning light) - not required, unless connecting to a 3dr loom.
L8 Engine Loom.
ground = brown
battery = red or red/blue
ignition switch = black
fuel pump = black/red
rev counter = green
The brown/green wire is not required as it is for the fault light relay on the L1 or the air con on the L8.
thanks,
Manoj