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Following information is from my service manual for 1993 850 GLT. Yours should be similar.
The Fuel Pump Relay is located next to the fuse box, under a cover, with other relays. It is second from the right on the row closer to the fire wall (there should be two rows of relays). To open the cover, remove torx screws.
"reference sensor" sounds very generic. I can try to look it up if you can provide more information. Air/flow meter & throttle position are the two sensors in the Fuel Delivery and Air Intake System.
Later.
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