Kensey

Ok, keep an open mind here.

I have a 72 Delta 88. I had to replace the gas tank. No one makes a new one, trust me I checked everywhere.

I retro fitted a 72 Cutlass tank. Minor tweaks and it fit fine.
I also installed a 72 Cutlass sending unit.

My gauge is reading FULL, but I don't think that correct. I'll drive it out more.

ANYWAY, MY QUESTION IS will a Cutlass sending unit work with a Delta gauge?

Thoughts?

Thanks.

joe_padavano

Both use a 0-90 ohm sender, so the Cutlass sender should work.

oldcutlass

Yes, the gauge does not care which sending unit is in there as long as its 0-90 ohms.

Sugar Bear

Agree it will work...was it empty and read E following the install and then went to full with some fuel added? If read F right after the install, no fuel added it is likely an open circuit/no ground.

Good luck!!!

jaunty75

Sugar Bear is correct. If the gauge reads full all the time, you have an open circuit (infinite resistance). Check your wiring.

Kensey

Cool! I'll run it down a little more to see if the gauge moves. If not, I'll check the grounds.

Grounds would be at the sending unit AND at the gauge correct? The unit ground it good, I know that.

Thanks all!
Kensey
Pittsburgh, Pa

jaunty75

No! The system is grounded at only one point, and that's by the second wire coming off the sending unit. It's attached to the body or frame under the car by the fuel tank. The dash gauge is connected on one side to +12V from the battery and on the other side to the sending unit.


If the ground at the sending unit is good, you may have an open in the wire between the gauge and the sending unit. As you certainly know if you've replaced the sending unit, there is a connector at the rear of the car usually behind the license plate or somewhere around there, where the wire from the sending unit is connected to the wire from the gauge. Make sure that connection is secure. If you still have the problem, you might disconnect the wire at the gauge and where it connects to the sending unit and test for continuity. The wire running from the gauge to the sending unit, which runs the length of the car, might have a break in it.

joe_padavano

Well, actually, there is a ground connection to the gauge, but it is part of the printed circuit and doesn't require any special attention.

oldcutlass

Take the wire that is connected to the sending unit (not the ground) and touch it to ground with the key on, the gauge should go to E. If you remove it and let it just hang not touching any metal, the gauge will read way past full.

oldcutlass

Yes, its a chassis ground. Looks like this: