Power from Taillight is wired to fuel sending unit... Check!
65 Diagrams from MyMopar:
http://www.mymopar.com/downloads/1965/65ValiantBarracudaA.jpg
http://www.mymopar.com/downloads/1965/65ValiantBarracudaB.jpg
See diagram "A" top left of page is the kick panel connector
1...Dark Blue is your sender
2..BLACK is tail
3..DK GREEN is turn
4..VIOLET is backup
5..No Connection
6.. BROWN is turn
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