Clocks

Hi, I know it's been posted a few times(I've tried searching) I've got a 1993 1.0 lx, I've just got some sr clocks, I've found the wire at pin 2 ecu, the black plug(under ecu) doesnt have a missing wire(every wire that goes in comes out)
Can I join direct from pin 2 ecu to the black plug at back of the clocks?
If so, theres just the green plastic with the electric contact, does anyone know which pin it would be or is it a case of trial and error?
Thanks
 
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