Not Ranked
The sending unit that comes with the fuel tank from Classic is the correct one. I'm not following what you have in yours. If you didn't use their tank or sender then use a GM 0 to 90 ohm from VDO. If you are using the Classic sender you may have a ground problem. I always run a separate ground from the dash to the cowl bar. If you don't you will get false readings from your guages. There is a single lug ground that goes to the speedo mount which is wire #190 run a ground from that point to the cowl. If I missed something in your explanation please let me know.
Don
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