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Ok, so my 71 base model 2 door hardtop Nova has an automatic trans dash panel in it-Park, Neutral, Drive, Etc. and someone put a 3 speed manual in the floor.
My gas gauge isn't working correctly. it says it's full of gas but only has 15 bucks in the brand new 18 gallon fuel tank...not full, as gas is 3 something a gallon.
I installed a new Fuel Sending unit when I put in the new tank no leaks, she rides down the street saying she's full... Is this because the dash panel is for an auto and the dash isn't set up for an 18 gallon tank or the wirings different or am I way off???

Any helps appreciated
 

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Disconnect the wire at the gas tank and ground it to the body. The gauge in the dash should go to empty. If it does, the problem is with the new sender or the ground wire that attaches to the sender and goes to the body.

If the gauge does not move there is an open circuit somewhere between the tank and the gauge in the dash.
 
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