Fuel guage question

[19Fordy]

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On my 40 I get a reading of about 6.3 V coming from the gauge wire that runs from the gauge to the gas fuel tank sending unit.
Carefully check your wiring with this 40 Ford wiring diagram.
https://www.fordbarn.com/forum/showt...wiring+diagram

Just for the heck of it try using only a 6V dry cell to supply Voltage to your gas tank sending unit. Make sure your gauge is not grounded against your dash etc. Look here:
https://www.fordbarn.com/forum/showt...ford+gas+gauge

I also ran a separate ground wire from the gas tank sending unit to the frame to make sure it has a good dependable ground. Normally, the gas tank sending unit is grounded by being attached to the metal tank which rests on the frame. A separate ground wire is good insurance.