All I am left with is this........

What's slightly tricky is I have THREE nibbled wires coming out of the main loom on the chassis and FOUR in the tape wrapped loom going to the inhibitor switch for the overdrive..... added to which I don't now have ANY wires coming out of the overdrive solenoid....
I can't tell which wires connected to what. I presume one of the four connected to the overdrive solenoid, but I have no idea which one. Is anyone able to tell me what colours the wires coming out of the main loom are supposed to be and their function and what colours the wires going to the inhibitor switch are supposed to be? Then which wires connect to which? Does the inhibitor switch also activate the reversing lights?
Somehow I need to get a connection back onto the solenoid..... is it possible to remove the solenoid (without losing all the oil in the overdrive unit) and then solder a new wire on? what do I need to watch out for in removing the solenoid?