Fuel Sender OHM rating

**BLACK MOON** · 06-05-07, 08:58 AM

Does anyone know the ohm range for a midyear fuel gauge? I'm changing all of my 'restored' gauges out to Autometer gauges. They make several different fuel gauges depending on the sender's rating.
Thanks guys.
Sal

**paul67** · 06-05-07, 11:30 AM

"90 OHMS" is stamped on the sending unit.

http://img.photobucket.com/albums/v1...97/fuel007.jpg

**JohnZ** · 06-05-07, 03:42 PM

Originally Posted by paul67

"90 OHMS" is stamped on the sending unit.

http://img.photobucket.com/albums/v1...97/fuel007.jpg

Yup - zero ohms empty, 88-90 ohms full.

**BLACK MOON** · 06-05-07, 09:07 PM

Thank you both.

While I'm asking questions; does anyone know where to buy an aftermarket 5" clock. Corvette Instrument Service shows a silver faced clock with a corvette logo on the face. I'm converting over to Autolite silver faced gauges and would like to find a matching clock.

Thanks again.
Sal

**Ken Anderson** · 06-13-07, 12:29 PM

Originally Posted by JohnZ

Yup - zero ohms empty, 88-90 ohms full.

Actually, Delco changed the upper ohms years ago to 110 to correct the "less than full issue".

**BLACK MOON** · 06-13-07, 08:03 PM

Originally Posted by JohnZ

Yup - zero ohms empty, 88-90 ohms full.

I'm being told that the sender will have to be changed to a 68 or later unit in order to use Autometer Gauges. Any thoughts?

**JohnZ** · 06-16-07, 08:34 PM

Originally Posted by BLACK MOON

I'm being told that the sender will have to be changed to a 68 or later unit in order to use Autometer Gauges. Any thoughts?

I'm sure that's correct - the '63-'67 powered voltage-divider fuel gauge circuit was an "experiment" that was dropped at the end of '67 and never used again. The GM-standard simple resistance circuit was used again starting in 1968, and should be compatible with Autometer gauges, assuming the ohm range is the same.

**BLACK MOON** · 06-16-07, 08:39 PM

Originally Posted by JohnZ

I'm sure that's correct - the '63-'67 powered voltage-divider fuel gauge circuit was an "experiment" that was dropped at the end of '67 and never used again. The GM-standard simple resistance circuit was used again starting in 1968, and should be compatible with Autometer gauges, assuming the ohm range is the same.

Thanks John.
Who has the best prices on electrical equipment like senders?
Sal

**paul67** · 06-17-07, 05:34 AM

What is the "less than full" issue?

**Ken Anderson** · 06-18-07, 08:25 AM

Originally Posted by paul67

What is the "less than full" issue?

At 90 ohms the dash gauge never quite gets to full . Owners complained, so it was changed to 110 ohms which pegs the dash gauge past "full" without filling the tank to overfull.