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Very pleased to have got myself a Gamma head unit in good condition, works a treat and sounds better than the ageing Blaupunkt Frankfurt that came out. To my embarrassment though i now realize that the Gamma only has a 2x20w internal amplifier and i now only have front sound. 
The 2 x 8 pin ISO connectors are still in my car's loom and got the unit up and running in a jiffy, i also have just found the 10 pin red ISO connector buried in my dashboard. That only has 3 wires in it and doesn't supply any sound to the rear.
From research on here and other sites i have identified almost all of the pins in the 10 pin connector, I think I just need to add some wires and mini 2 channel amplifier and i am up and running again.
From research, looking at pins in connector and labelled on the sticker:
HL + HR = line out for left and right rear speakers.
VL + VR = line out for left and right front speakers.
Earth symbol = ? is this a common earth for use with the line out signals? The head unit has its own earth in one of the other connectors.
ENA, DATA, CL = all involved in displaying information on the dashboard but i'm not sure my dashboard with retro fit autocheck will work. (These are the 3 wires connected in the plug).
NF-st = NOT SURE ON THIS ONE. Is this a switched live output for turning on amplifier if the car was fitted with the active rear speaker option mine hasn't got?
Can I please run my plan past the ICE experts on here to see if it is 'sound'?
HL and HR pins connect to the center terminal of a RCA/phone plug
Earth symbol pin split and shared between the outer earth connections of RCA/phone plug.
This will supply signal to the inputs on my amplifier.
Use NF (if it is a switched 12V) to turn on the amp.
Adjust level of amplifier gain to get the right amount of rear sound as there is no front / rear fade control on my Gamma.
Turn it all down and enjoy sound of engine.
thankyou in advance for any news, ideas or experience on what you have done getting rear sound out of your Gammas!
The 2 x 8 pin ISO connectors are still in my car's loom and got the unit up and running in a jiffy, i also have just found the 10 pin red ISO connector buried in my dashboard. That only has 3 wires in it and doesn't supply any sound to the rear.
From research on here and other sites i have identified almost all of the pins in the 10 pin connector, I think I just need to add some wires and mini 2 channel amplifier and i am up and running again.
From research, looking at pins in connector and labelled on the sticker:
HL + HR = line out for left and right rear speakers.
VL + VR = line out for left and right front speakers.
Earth symbol = ? is this a common earth for use with the line out signals? The head unit has its own earth in one of the other connectors.
ENA, DATA, CL = all involved in displaying information on the dashboard but i'm not sure my dashboard with retro fit autocheck will work. (These are the 3 wires connected in the plug).
NF-st = NOT SURE ON THIS ONE. Is this a switched live output for turning on amplifier if the car was fitted with the active rear speaker option mine hasn't got?
Can I please run my plan past the ICE experts on here to see if it is 'sound'?
HL and HR pins connect to the center terminal of a RCA/phone plug
Earth symbol pin split and shared between the outer earth connections of RCA/phone plug.
This will supply signal to the inputs on my amplifier.
Use NF (if it is a switched 12V) to turn on the amp.
Adjust level of amplifier gain to get the right amount of rear sound as there is no front / rear fade control on my Gamma.
Turn it all down and enjoy sound of engine.
thankyou in advance for any news, ideas or experience on what you have done getting rear sound out of your Gammas!
(or maybe a UK wiring label) 
but it is nice that it works! 
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