do i need a special wire harness for the gauge package. my gas gauge is not working i know i need different sending units can any one thats changed theres help me

When my gas guage did not work ( after I had replaced the sending unit) , I found out I had a bad printed circuit behind the dash...I bought a new from Ames, I dont think I would pout in a used circuit, too chancey...If you know for sure its the wiring you can prob. buy some used , but even there You`d be better off w new stuff...its available..
Bjorn