problems with a 67 gas gauge.after a fill-up it went to empty.
With the tan wire disconnected and switch off it reads slightly above empty.
With the tan wire disconnected and the switch on it goes to empty. Shouldn't it go to full?
Tank is 3/4 full now and with tan wire disconnected get a reading of 61 ohms
that sounds right to me. Where do I go now?

Join the club.. I have gas gauges problems, too.

With the tan wire disconnected and the switch on, it should read past full....
The ohms reading sounds right..... that's all the help I can give... sorry.

And good luck!

You likely have a short somewhere. All the way to E is shorted, all the way fast F is open. You can check the sender with a volt ohmeter. It should be between about 10 and 90 ohms.

If you are reading 60 ohms at the tan wire (disconnected) with 3/4 tank like you said, and you take this reading at the cluster end of the wire, you can rule out the sender.

If you have power on the gauge, your gauge is defective, that is the only thing left.

You can bench test the gauge with a power supply and variable resistor, or even a fixed resistor to ground.

If you ground the tan wire that leads to the gauge and turn on the ignition, the gauge should read empty. If not, the gauge is bad.

try grounding the gauge housing as well, this has fixed several of these gauges i have encountered. If not like the other said check to make sure the sender is good (which you have) then check to make sure the wire to the sender from the cluster is good (no shorts, or no abnormally high resistance) and then maybe consider the gauge. I have not had good luck with some aftermarket OEM style gauges, so make sure if you replace it you get a good one