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No, the oil sending unit has nothing to do with the fuel system gauge. Did you find out if the new sending units have power? I would do that and then see if you are getting a signal to the gauge or the tank switch. You might try your local Ford dealerships for some wiring diagrams or try a site like Faxon Automotive Literature or Lloyd's Automotive Literature or E-Bay for some chassis manuals which would have the wiring diagrams. Hope that proves helpful here. Please get back to me if you need more as all follow ups are included in our fee.