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Old 05-05-2012, 02:43 PM
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GM Fuel Tank Sender

Ok, I'm putting a 0-90 ohm Gm sender in my fuel cell (pro street Chevy Luv) and running one wire from the sender (from the post marked "to gauge") to the gauge (Autometer 3314). Does the other wire on the sending unit just go to a switched +12v? There is nothing on the sender saying where the second wire goes/comes from, and neither does the 1/4 page of instructions that came with it. I've never dealt with the electrical for fuel cells/senders and have no clue!
Thanks!
Smokey

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Old 05-05-2012, 03:03 PM
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If it is just a sending unit, (no pump), the second wire is connected to a good chassis or body ground. (12v -) A dedicated ground wire from the sender to the gauge ground is the best way to make sure you won't have gauge accuracy issues. You don't need a large wire, 18 or 20 gauge is plenty.

Later, mikey
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Old 05-05-2012, 03:19 PM
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Cool deal, thanks. The fuel pump is external, so no issues there. Much appreciated, thanks!
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