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Hi all wired up my guage to the fuel tank when tank is empty guage reads full and when tank is full guage reads empty if i change the wires around on the guage will this solve the problem or will i get magic smoke:drunk:
 

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you didn't say what this is in or what gauges you have, but it sounds like you have a mismatched gauge and transmitter. Ford and chevy type systems work opposite each other. It sounds like you have a Ford type gauge and a Chevy transmitter or vice versa.
 

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If you are going to run that gauge , you need to change the sending unit.
Some senders read high resistance when full, some read low. If you have a high reading sender where a low is required, you end up with a reverse reading.
To check the gauge, pull the wire at the sender and ground it. If the gauge reads empty, then it needs a low resistance when empty and high when full.
If the gauge reads full,then it needs a low resistance when full and a high resistance when empty.
What gauge is it? Maybe we can narrow it down

Sparkchaser has given a perfect example.
 

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sender-gage match

different gages also have different ranges of operations, One may be for example 80 to 140 for empty to full and another may be 120 to 300 not real number just the example.
 

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What car/sending unit do you have?
From what I was reading about them, if you dont specify what sending unit you are using, dolphin sends the GM type 0-90 ohm unit 90 ohms full, 10 ohms or less at empty, which is backwards from what a ford unit will send.
 
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