Re: 67-72 Chevy Truck fuel gauge diagnostics 101
I am using a new AC Delco fuel gauge and a GM 0-90 ohm sending unit.
These photos show how the gauge is wired to the sender and I use a 10 amp batt charger for power.
The ground can be shared between the sender and the gauge.
I use a yellow jumper as the "tan" wire that runs from sender to fuse panel and then to cluster.
I use green lead from my batt charger for the pink power wire from the ignition switch through the fuse panel and to the circuit board in location number 3 on the connector.
It is really this simple. If you can do this, you can test your fuel gauge out of the cluster.
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Contact me on all of your gauge cluster needs. I specialize in restoration, repair and parts sales for 67-72 Chevy and GMC trucks. email me at tbonegarris@yahoo.com
I am also a dealer for Counterpart for gauge cluster parts only.
Also see my facebook page, CG&C
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