All analog meters are just measuring the "voltage drop" across a
resistance.  The key is to have the appropriate voltage input +12v.  If the
+12v and the sensing line were reversed then the "voltage drop" would be
"negative" driving the needle to the empty peg.

Josh
On Apr 4, 2015 7:08 PM, "Wally Bryant via CnC-List" <cnc-list@cnc-list.com>
wrote:

> I thought they were Ohm meters. Anyway, I just Googled it to make sure,
> and see a ton of pages on testing marine fuel sender resistance.
>
> Wal
>
> you wrote:
>
>> I agree with your diagnosis.  It's gotta be reversed polarity...of the
>> sense and gnd.  Fundamentally the fuel gages are just voltage meters.
>> They
>> respond proportionally to the voltage drop across the variable resistance
>> in the sender.  I would disconnect the leads and use an ohm meter to
>> measure and validate the resistance of the senders.  Switching the
>> polarity
>> of the sense and gnd monetarily probably won't break anything.  Before
>> doing so validate that your wiring looks like the attached picture.
>>
>
>
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