Digiplex ignition module ground wires?

(1981 308 GTSi US) I was in the process of trying to chase down the ground connection for the coolant expansion tank temp sensor (sometimes the warning light comes on dimly while driving). I removed the cover for the ignition modules and found 2 loose wires plus 2 washers and a nut. If I had to guess I’d say they’re ground harnesses and the nut/washers are to fasten the eyelets to a ground stud. I’ve looked around in the general area and can’t find a ground stud anywhere. What are these wires for, and where are they supposed to connect?
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The plate cover bolts will fit through those eyelets, so that would work. That doesn’t explain the nut and washers I found on the carpet directly under the modules and cover plate, though. I thought those might be to secure the ground wire eyelets to a ground stud.

I guess I’ll clean up the connections and mating surfaces and bolt it all back together.

Thanks for your replies!

 

I later found a diagram showing proper attachment points:
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