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davbytrace 02-02-2013 04:29 PM

Fuel Gauge Reads Backward..maybe?
1979 CJ7 with 304.

I installed a VDO fuel Gauge in the dash. I verified that the gauge is appropriate for the ohm range that the CJ sender operates at. When I installed it, the tank was 1/2 full, and the gauge read 1/2 as it should.

When I filled it up, the gauge went to zero.

Has anybody seen this happen? Any clues?

John Strenk 02-02-2013 05:46 PM

Might be the right resistance range but backwards.

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davbytrace 02-02-2013 10:09 PM

Soooo....could I hook the signal to the negative and ground to the signal and get a correct reading?

John Strenk 02-03-2013 05:32 AM

Chances are no.

Most likely reversing the voltage will drive the meter into the opposite direction.

You could install a YJ sender. They have the opposite resistance range.

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