The reefer/ignition wire (grey) and tire-tele (orange) were the additional wires usually indigenous to the 9 way plug of 1985 - 1988.
On both the 7 & 9 way plugs the red is left turn & stop, the green is running lights (tail & clearance).
Having a red & green outside of the main umbilical is a mystery to me.
If I found those wires and couldn't visually trace them out; I would feed 12VDC to them, ground to the frame ...
and see if anything lit up!
I personally do not have any experience with LPG/monitor control panels & their wiring.