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Hi Ron,
The '93 940 diagrams list everything for that ground that might be there, apparently depending on turbo vs NA and world market applications. In your case, the one thing that doesn't ground there is anything ignition-related.
Looking at the REX ignition wiring, I see grounds at the 2 fuel relay terminals (1 black, 1 brown).
FWIW, I played around with those grounds as well as the unit mounting bolts THIS POST where only the black ground affected anything (but ONLY when the whole unit was isolated from it's inner fender mounting location.
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Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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