keepitcountry

can anybody tell me what the single green wire from the isv control unit goes to? (1991 1.8 16v) it has a black connection and can only go to one other wire with a black connection as far as i can see? i have just rewired the engine and seem to have no speedo reading and a pretty strange erratic idle that keeps jumping and wont stay still any pictures of wiring behind the fusebox would be a huge help many thanks