Mounted the factory fuel pump

75slant6 said

Would the stock magnum sending unit or the gm sending unit work with the factory fuel gauge?

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I doubt the sending units will work with the factory gauge. I'm planning on using a programmable aftermarket gauge.

If you were able to leave the stock sending unit in place, while still adding the pump, you could probably use the factory gauge. My sending unit was toast, so I am going to use the magnum sending unit.