The gas gauge lays way past full with the tank about 2 gallons from full. I get 8.3 volts from the front and 53-54 ohms from the connector through the sender to the ground terminal. Seems low. The gauge still doesn't work. The sender and tank are both new although that could be the problem. Any ideas?

Keith,

Something is definitely a-miss here.

Check the guage by focusing at the REAR of the car. Pull the tan sender wire that leads back up into the trunk apart of the rear harness. Take a piece of scrap wire and connect one end into the tan wire's "boot" and the other end touch to a clean metal ground. The guage should drop like a stone to "E" when ignition turned on. Disconnect said test wire, leave the boot hanging with no connection. Turn ignition on, Needle should go waaay past "F".

If this works, the guage is fine and you need to focus on the gas tank sending unit, it's ground and associated wiring.

At a full tank, you should be at approx. 90 ohms. Empty is close to zero ohms.

When I ground out the tan wire, the gauge goes to 7/8 full. Looks like the problem is up front.

When I ground out the tan wire, the gauge goes to 7/8 full. Looks like the problem is up front.

Yep. Are you having any other dash problems? Most likely its a connection problem. Try the same test at the dash to intermediate harness connector. After that its going to take pulling the gauge.

The front end lighting harness was butchered to install an internally regulated alternator. Heaven knows why. I've put over 250K miles on the the original stuff with no problems. The old external regulator change out might take all of 15 minutes. Big deal. Up under the dash, the gas gauge at least has the wires hooked up to it. I've installed aftermarket gauges and everything else works.....even the radio. I need a challenge anyway. Now I have it.