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Sending unit fuel level wiring


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Lost the fuel gauge in my jeep last year due to a wire coming off (again).  The PO Zip-tied it in place, which worked until the fuel pump died.  Attempted to re-zip it in place during the roadside fix and failed.  So how should I properly repair this, short of a full sending unit rebuild?  Solder it back on? Seems like its just on plastic (Although dirty). 

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Played with this a bit-  I can stick a new wire into the broken rivet hole, and it will swing down to empty.  But it won't read accurately.  I know that the problem is isolated to the hanger- the gauge worked perfectly before the pump swap, and stopped after.  

Worst case, can I cannibalize the potentiometer from a Cherokee hanger? Its in good shape other than this.  And it seems my other options are A) send it out to be rebuilt (200 dollars), or swap in an 86 tank/XJ sending unit (also almost 200 bucks).  Both of which Id rather not spend! 

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