Should only be One Wire on Sender even though some do have 2 Terminals. Where does the second Wire go to if not the Gauge?  Maybe someone thought it should have a Ground Wire.

  

Wiring goes as so:

Battery "hot" to Ign. sw; ign. sw. to gauge; other gauge wire to sender; sender body is grounded through engine block back to battery "ground".  This completes circuit.  Other "tab" on engine "Sender" was for connection of "overheat switch" on right bank; eliminated due to "not found necessary" (read that "unnecessary expense" to Ford manufacturing = more profit).  Those switches can still be found [rare] and installed/wired to function as originally designed/installed.

That "extra" tab is NOT a ground; do not try that - it WILL burn-out your gauge in short order!

Regards, JLB




55 Ford Crown Victoria Steel Top