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If your car uses the CAN-bus system it is possible the system must be told it has a new fuel pump and gauge unit fitted before it will work.
Any codes connected with the instruments can't be read on a normal obd2 scanner or code reader and altogether more dedicated equipment and software is needed for car and chassis systems. Obd2 is only for things that will or are likely to affect tailpipe emissions.
sorry but it looks like you will be in that tank again. pull the pump out and plug it into the car wiring outside the tank and move the float up and wait 60 seconds. if it doesn't move the gauge, replace the sender (with a new one or maybe with the old one, if you still have it) and test it before you install it
You could try changeing the fuel pump relay The fuel gauge signal come from the pump and goes through the relay to the gauge and on your vehicle the pump will still work even if the relay is bad it has a back up power system through the oil pressure sending unit . The relay is located inside of the glove box behind a panal its the one on the far left. I also have wiring schematic of the system but would need to fax it . If you want it get back to me with a fax #