Gas gauge woes..

I installed my new gas tank. Okay...I used my new float sender...which I already had in my old tank that worked fine. I put my new tank in today...with the float that worked. Grounded the wire from the sender tube to the fuel line. Kind of jumping over the rubber hose connection. Now my gas gauge is not working. I know its not the gauge. What happened? Any advise?....1971 plymouth valiant...slant 6.....