Hello, i swapped a 5.3 into friends trucks. The problem i am having is the fuel gauge is reading backwards. Truck was carburated and with dual tanks but i bought a new tank complete with sending unit from a EFI 1987 r10 and swapped that in but now with only one tank on the drivers side. I want to remove the switching unit for the tanks but for now i dont think it should have to do with my problem but what i did was just connect the drivers side tank and left the pass side disconnected. And i dont know if the gauge was working properly before because the truck was bought from the previous owner not running and started to tear down right away for the swap. Anyone knows if the 87 r10 trucks have different sending units or different gauges or something? Any ideas i could try?
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