Might as well throw my 2 cents in too. My '69 GTO I replaced the sending unit as well as the tank. Original tank leaked, gauge did not read correctly. On my 2nd one from NPD ( they have a warehouse local ) and still does not read correctly. Full tank reads at 3/4 tank on gauge. With tank full disconnected brown wire inside trunk and checked ohms to ground thru sending unit and had 98 ohms. Grounded wire and gauge reads empty, ground removed and it reads full. Checked ohms from wire to gauge to ground and have 43 ohms. Don't know what that should be. With 98 ohms from sending unit it should read full not 3/4. Anyone know what ohms thru gauge should be?
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